add: `push-descriptions` command

[one-data-cookie]

Created based on internal script.

Changes

• add new dependencies through Poetry that amended poetry.lock and pyproject.toml
• add new command into __init__.py
• add source code to push_descriptions.py
• release as v0.2.0

Tests

• installed via Poetry
• ran on Superset staging with the same result as from internal script

Next steps

• release (tag on Github and publish on PyPI)
• add docs as v0.2.1

[one-data-cookie]

Thanks again, @sweco! Merging and publishing. 🎉