[Fixes #14309] Generalize remote service type registration and auth handling

[sijandh35]

Fixes #14309

Checklist

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[gemini-code-assist]

Code Review

This pull request refactors service type handling by introducing a centralized ServiceTypeRegistry and enhances remote resource upload handlers (including COG, FlatGeobuf, 3D Tiles, and WMS) to support authentication configurations (AuthConfig) during validation and import. It also integrates authentication credentials with GDAL configuration options for remote metadata extraction. The review feedback highlights several improvement opportunities: implementing lazy initialization in ServiceTypeRegistry to avoid inefficient re-initialization and loss of dynamic registrations, and adding safety guards in BaseRemoteResourceHandler to prevent potential AttributeErrors when service_url, _exec, or options are None or empty.

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[codecov]

Codecov Report

❌ Patch coverage is 72.78107% with 92 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.91%. Comparing base (be64508) to head (6584bb3).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #14328       +/-   ##
===========================================
+ Coverage   34.71%   74.91%   +40.20%     
===========================================
  Files         982      984        +2     
  Lines       60496    60721      +225     
  Branches     8247     8289       +42     
===========================================
+ Hits        21002    45492    +24490     
+ Misses      38332    13381    -24951     
- Partials     1162     1848      +686     

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