fix: remove forced PlateCarree projection in add_layer issue (#2730)

[alepr]

Summary

This PR fixes an issue where the add_layer function forced ccrs.PlateCarree() by default, causing rendering errors when using custom projections. Fixes #2730

Changes

• Removed the forced ccrs.PlateCarree() coordinate system in ax.imshow().
• The function now correctly respects the user-defined projection.

Testing

• Ran existing geemap tests suite to ensure no regressions.
• Verified the fix in a Jupyter Notebook using a Issue: geemap cartoee.get_map() ignores region parameter and results in low resolution when using ax.set_extent() #2730 example.

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[gemini-code-assist]

Code Review

This pull request updates geemap/cartoee.py to support custom map projections by passing the projection (proj) through kwargs from get_map to add_layer. In add_layer, the projection is retrieved and used as the transform parameter. The feedback suggests a more idiomatic Python approach using kwargs.get() to simplify the projection retrieval logic.

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[gemini-code-assist]

Using dict.get() is a more idiomatic and concise way to retrieve a value with a default fallback in Python, replacing the multi-line if-else block.

    proj = kwargs.get("proj", ccrs.PlateCarree())