[sc-28999] Custom metadata command

[usefulalgorithm]

🤔 Why?

Need a command to manage custom metadata.

🤓 What?

Added command for custom metadata. Subcommands:

• get: get custom metadata on a dataset
• add: add a single custom metadata
• remove: remove a single custom metadata
• update: batch update with an input file

🧪 Tested?

Listing custom metadata:

Adding custom metadata:

Batch update:

Also added unit tests.

[github-actions]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
691	480	69%	0%	🟢

New Files

File	Coverage	Status
aesop/commands/aspects/custom_metadata.py	82%	🟢
TOTAL	82%	🟢

Modified Files

File	Coverage	Status
aesop/app.py	86%	🟢
aesop/commands/aspects/user_defined_resources/tags/node.py	70%	🟢
aesop/commands/common/arguments.py	52%	🟢
aesop/commands/webhooks/webhooks.py	70%	🟢
TOTAL	69%	🟢

updated for commit: 9a1ac4e by action🐍