Add exists_ok and force flags to create_table

[seapagan]

• add exists= flag to the create_table method.
  • this defaults to True and will silently ignore a table if it already exists. If you set to False, it will instead raise a TableCreationError
• add force= flag to the create_table method.
  • this defaults to False. If set to True , it will explicitly drop then re-create the table.

[codacy-production]

Coverage summary from Codacy

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Coverage variation	Diff coverage
✅ +0.04% (target: -1.00%)	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (cdd369e)	506	499	98.62%
Head commit (0ad2f67)	522 (+16)	515 (+16)	98.66% (+0.04%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#34)	17	17	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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