chore: cd workflow

[d-v-b]

this adds a cd workflow for zarr-metadata

we either publish to pypi, in which case the version declared in the package is used, or we publish to testpypi, in which case a synthetic, unique version is created to ensure that we never have a conflict on testpypi.

this workflow only supports workflow dispatch right now. later PRs will add a tag-based release workflow.

TODO:

• Add unit tests and/or doctests in docstrings
• Add docstrings and API docs for any new/modified user-facing classes and functions
• New/modified features documented in docs/user-guide/*.md
• Changes documented as a new file in changes/
• GitHub Actions have all passed
• Test coverage is 100% (Codecov passes)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.27%. Comparing base (f8c0c5d) to head (59e0cc0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3935   +/-   ##
=======================================
  Coverage   93.27%   93.27%           
=======================================
  Files          87       87           
  Lines       11676    11676           
=======================================
  Hits        10891    10891           
  Misses        785      785           

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