Initialise the repo with a current snapshot of Bunny

[beforan]

Pull Request Contents

🛠️ Repo maintenance

Description

This PR moves Bunny from the hutch-cohort-discovery monorepo to its own standalone repository.

As a result of the move:

• source structure has changed somewhat to reflect a conventional "src folder" python package.
• new, more standard pyproject.toml was bootstrapped with uv to better reflect the above convention
• build tooling is now uv rather than poetry
  • uv will self install the hutch-bunny package as editable for decvelopment.
• linting and formatting now uses ruff rather than black.
• tests moved up a level
• New Dockerfile based on uv's Debian slim image, instead of pure python Debian full using poetry
  • Bunny images are now c. 400MB vs 1.8GB
• updated dev compose files:
  • standalone Bunny, assumes existing external Database and Upstream Task API.
  • Bunny with Relay and Postgres now references published Relay images, not built from source
• Updated pandas and numpy; confirmed Bunny works with numpy 2.x
• Bunny uses psycopg3 (psycopg) as its postgres driver now, rather than sqlalchemy's default of psycopg2. Confirmed working.
• Bunny targets Python 3.13 now.

Related Issues or other material

• This PR relates to one or more issues, detailed below

• Related Issue Repository Housekeeping hutch-cohort-discovery#160

Screenshots, example outputs/behaviour etc.

✅ Added/updated tests?

• This PR contains relevant tests
  • Or doesn't need to per the below explanation

Tests migrated from the old repo - confirmed passing in new structure / with new tooling.

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