[Fixes #14136] Fixes the support for creation of dataset with generic Geometry type

[sijandh35]

Fixes #14136

Checklist

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[gemini-code-assist]

Code Review

This pull request implements support for generic 'Geometry' types within vector handlers and empty dataset utilities, mapping them to Django's GeometryField and GeoServer's JTS Geometry binding. It also updates the setup_dynamic_model method to support layer names provided as strings. A review comment suggests updating the type hint for the layer parameter in setup_dynamic_model to include str for better type safety and clarity.

[github-actions]

The backport to 5.0.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-5.0.x 5.0.x
# Navigate to the new working tree
cd .worktrees/backport-5.0.x
# Create a new branch
git switch --create backport-14137-to-5.0.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 197bc3d657be167c0b1d2fb75af2d7c9e9314c72
# Push it to GitHub
git push --set-upstream origin backport-14137-to-5.0.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-5.0.x

Then, create a pull request where the base branch is 5.0.x and the compare/head branch is backport-14137-to-5.0.x.