mypy ain't happy. make it so.

[sitzz]

Currently mypy is downright unhappy with this code, as of this writing these are the results:

couchbase_helper/couch.py:6: error: Cannot find implementation or library stub for module named "couchbase.auth"  [import-not-found]
couchbase_helper/couch.py:6: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
couchbase_helper/couch.py:7: error: Cannot find implementation or library stub for module named "couchbase.cluster"  [import-not-found]
couchbase_helper/couch.py:8: error: Cannot find implementation or library stub for module named "couchbase.diagnostics"  [import-not-found]
couchbase_helper/couch.py:9: error: Cannot find implementation or library stub for module named "couchbase.exceptions"  [import-not-found]
couchbase_helper/couch.py:10: error: Cannot find implementation or library stub for module named "couchbase.n1ql"  [import-not-found]
couchbase_helper/couch.py:11: error: Cannot find implementation or library stub for module named "couchbase.options"  [import-not-found]
couchbase_helper/couch.py:26: error: Cannot find implementation or library stub for module named "couchbase.result"  [import-not-found]
couchbase_helper/couch.py:42: error: Incompatible default for argument "logger" (default has type "None", argument has type "Logger")  [assignment]
couchbase_helper/couch.py:42: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
couchbase_helper/couch.py:42: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
couchbase_helper/couch.py:95: error: Incompatible default for argument "opts" (default has type "None", argument has type "dict[Any, Any]")  [assignment]
couchbase_helper/couch.py:95: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
couchbase_helper/couch.py:95: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
couchbase_helper/couch.py:117: error: Incompatible default for argument "opts" (default has type "None", argument has type "dict[Any, Any]")  [assignment]
couchbase_helper/couch.py:117: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
couchbase_helper/couch.py:117: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
couchbase_helper/couch.py:117: error: Incompatible default for argument "per_key_opts" (default has type "None", argument has type "dict[Any, Any]")  [assignment]
couchbase_helper/couch.py:157: error: Incompatible default for argument "opts" (default has type "None", argument has type "dict[Any, Any]")  [assignment]
couchbase_helper/couch.py:157: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
couchbase_helper/couch.py:157: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
couchbase_helper/couch.py:179: error: Incompatible default for argument "opts" (default has type "None", argument has type "dict[Any, Any]")  [assignment]
couchbase_helper/couch.py:179: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
couchbase_helper/couch.py:179: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
couchbase_helper/couch.py:179: error: Incompatible default for argument "per_key_opts" (default has type "None", argument has type "dict[Any, Any]")  [assignment]
couchbase_helper/couch.py:219: error: Incompatible default for argument "opts" (default has type "None", argument has type "dict[Any, Any]")  [assignment]
couchbase_helper/couch.py:219: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
couchbase_helper/couch.py:219: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
couchbase_helper/couch.py:232: error: Incompatible default for argument "opts" (default has type "None", argument has type "dict[Any, Any]")  [assignment]
couchbase_helper/couch.py:232: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
couchbase_helper/couch.py:232: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
couchbase_helper/couch.py:249: error: Incompatible default for argument "opts" (default has type "None", argument has type "dict[Any, Any]")  [assignment]
couchbase_helper/couch.py:249: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
couchbase_helper/couch.py:249: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
couchbase_helper/couch.py:262: error: Incompatible default for argument "opts" (default has type "None", argument has type "dict[Any, Any]")  [assignment]
couchbase_helper/couch.py:262: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
couchbase_helper/couch.py:262: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
couchbase_helper/couch.py:311: error: Unsupported operand types for < ("int" and "None")  [operator]
couchbase_helper/couch.py:311: note: Right operand is of type "int | None"
couchbase_helper/couch.py:343: error: Item "None" of "dict[str, Any] | None" has no attribute "items"  [union-attr]
couchbase_helper/couch.py:370: error: Incompatible default for argument "opts" (default has type "None", argument has type "dict[Any, Any]")  [assignment]
couchbase_helper/couch.py:370: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
couchbase_helper/couch.py:370: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
couchbase_helper/couch.py:370: error: Incompatible default for argument "expiry" (default has type "None", argument has type "int")  [assignment]
Found 22 errors in 1 file (checked 2 source files)

Some errors are "repeat offenses" so fixing shouldn't bee too difficult.

Could be solved together with #5 and/or #7.