✨ source-zendesk-chat: migrate to poetry

[alafanechere]

What

Relates to #34958
We want to make our connectors use poetry for dependency management (see tech spec)

This PR is migrating source-zendesk-chat to poetry.

How

• Create pyproject.toml and poetry.lock
• Pin main dependencies to the version used in the previous connector version
• Delete setup.py
• Update connector README.md with new instructions

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