Gh python3

[chenkasirer]

Fixed compas_ghpython not importable in Rhino 8 CPython components, mostly by:

• Avoiding compas_rhino.drawing imports within compas_ghpython
• Modifying the plugin discovery logic to catch a new type of exception.

What type of change is this?

• [x] Bug fix in a backwards-compatible manner.
• [ ] New feature in a backwards-compatible manner.
• [ ] Breaking change: bug fix or new feature that involve incompatible API changes.
• [ ] Other (e.g. doc update, configuration, etc)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• [x] I added a line to the CHANGELOG.md file in the Unreleased section under the most fitting heading (e.g. Added, Changed, Removed).
• [ ] I ran all tests on my computer and it's all green (i.e. invoke test).
• [ ] I ran lint on my computer and there are no errors (i.e. invoke lint).
• [ ] I added new functions/classes and made them available on a second-level import, e.g. compas.datastructures.Mesh.
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [ ] I have added necessary documentation (if appropriate)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 60.23%. Comparing base (db0c5b0) to head (f0bc06b).

Files with missing lines	Patch %	Lines
src/compas/plugins.py	75.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1391 +/- ## ========================================== - Coverage 60.25% 60.23% -0.02% ========================================== Files 207 207 Lines 22251 22258 +7 ========================================== + Hits 13407 13408 +1 - Misses 8844 8850 +6 ```

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