Remove widget and napari plugin

[psobolewskiPhD]

In lieu of the widget and napari plugin being in this repo, remove them in favor of: https://github.com/imaging-formats/ome-types-widget

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[psobolewskiPhD]

The test fails are due to 4.0.0 of pytest-mypy-plugins.
Breaking changes:

• Breaking: Errors are now ignored in site-packages by default. The --mypy-only-local-stub flag
  has been removed and replaced with --mypy-no-silence-site-packages which can be used to restore
  the previous behavior if needed. This change was made to avoid errors being raised when enabling
  certain mypy options, e.g. the explicit-override error code or the --disallow-subclassing-any
  flag, which resulted in violations due to these not being supported with the stubs provided by
  typeshed for the standard library. In addition, this affected other error codes or flags for some
  third-party libraries in django-stubs.
• Breaking: When running in a subprocess (the default), PYTHONPATH is no longer set. With the
  above change, violations would still be raised in the main module for a test case, but those that
  were flagged in imported modules would no longer be raised. This was because these modules were
  being added to PYTHONPATH which caused mypy to treat them as belonging in site-packages and not
  as part of the first-party package. The new --mypy-modify-pythonpath flag can be used to revert
  to the previous behavior if needed.

Looks like mypy-only-local-stub can just be removed and the minimum pytest-mypy-plugins bumped?
Ah, but moving to 4.0.0 would drop py3.9...
Could stop-gap by adding a upper bound in this PR and then releasing it in #290 once new version of https://github.com/PyCQA/docformatter is released unblocking py314