Removed Spatial Enrichment + Cython

[srivarra]

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What is the purpose of this PR?

Removes Cython related files and Spatial Enrichment functionality from the repo. Updates the build process to reflect that. Using uv instead of regular python GitHub Actions. Updated the README badges.

How did you implement your changes

• Removed _bootstrapping.pyx and setup.py files.
• Removed spatial_enrichment files.
• Updated GitHub Actions workflows to use uv for building, testing and publishing. Removed cibuldwheel components of the workflows.
  • Due to ark now being a pure python package we do not need to build nor test on multiple platforms, so defaulted to ubuntu-latest for builds and tests. This simplifies much of the CI workflow and speeds it up. It is a good practice to still test across various Python versions however.
• Freshened up the README badges with some new ones.

Remaining issues
N/A.

[camisowers]

Few additional removals. Also seems like the builds/tests aren't running. Closes #1151 and #1150.

[srivarra]

@camisowers Builds and tests are running, it's just that the PR expects the originally named workflows to run, however they have been replaced with a simplified set of workflows.

[camisowers]

Looks good!