Allow choosing webgl version

[ibesora]

Following #5198, this PR allows to use a desired WebGL version by setting contextType inside the canvasContextAttributes option on Map creation.

Launch Checklist

• Confirm your changes do not include backports from Mapbox projects (unless with compliant license) - if you are not sure about this, please ask!
• Briefly describe the changes in this PR.
• Link to related issues.
• Include before/after visuals or gifs if this PR includes visual changes.
• Write tests for all new functionality.
• Document any changes to public APIs.
• Post benchmark scores.
• Add an entry to CHANGELOG.md under the ## main section.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.83%. Comparing base (ab63cf4) to head (4233f25).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5236   +/-   ##
=======================================
  Coverage   91.82%   91.83%           
=======================================
  Files         281      281           
  Lines       38829    38839   +10     
  Branches     6774     6785   +11     
=======================================
+ Hits        35655    35667   +12     
+ Misses       3045     3044    -1     
+ Partials      129      128    -1     

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