🐙 octavia-cli: implement init command

[alafanechere]

What

In order to create and manage configurations, we want them to be stored in a specific project directory architecture.
This PR implement octavia init command that will create the directory architecture in the current working directory:

.
├── connections
├── destinations
└── sources

How

• Declare a new init command which creates required directories in current working directory.

• Nondestructive approach: the init command does not recreate subdirectories that already exist.

• Add to the CLI context the PROJECT_IS_INITIALIZED boolean to enable other command to not run if project is not initialized.

• Bonus:

  • Allow users to pass a custom workspace id in the CLI options or through envvar
  • Check Airbyte API is reachable and healthy

Recommended reading order

1. octavia-cli/octavia_cli/init/commands.py + octavia-cli/unit_tests/test_init/test_commands.py
2. octavia-cli/octavia_cli/check_context.py + octavia-cli/unit_tests/test_check_context.py
3. octavia-cli/octavia_cli/entrypoint.py + octavia-cli/unit_tests/test_entrypoin.py

🚨 User Impact 🚨

New octavia init command:

Coming next

Our execution plan

[lmossman]

LGTM! Left a couple small suggestions and question but nothing is blocking, so feel free to merge when ready!

[alafanechere]

Thank you @lmossman for the review, I improved the error messages as you suggested.