Add contextAttributes map option

[ibesora]

This PR fixes #5135 by adding a contextAttributes property to the map constructor that supports all WebGLContextAttributes, so now you can do something like:

const map = new maplibregl.Map({
  container: 'map',
  style: 'https://demotiles.maplibre.org/style.json',
  center: [0, 0],
  zoom: 2,
  contextAttributes: {
    powerPreference: 'default',
    antialias: true
});

Note that some WebGLContextAttributes can't be overwritten because Maplibre relies on it. These are alpha, depth, stencil and premultipliedAlpha which are always set to true.

This PR also sets the default WebGL powerPreference to high-performance instead of default, which defaults to using dedicated GPUs on multi-GPU systems.

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.

[ibesora]

I'm working on enabling setting which WebGL version do you want to use but since that requires some changes on how shaders are compiled, I'm working on a branch on top of this to keep changes separated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.82%. Comparing base (3a3ed23) to head (a886440).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5196   +/-   ##
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  Coverage   91.82%   91.82%           
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  Files         281      281           
  Lines       38776    38777    +1     
  Branches     6758     6758           
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+ Hits        35605    35606    +1     
  Misses       3044     3044           
  Partials      127      127           

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[HarelM]

I've added a few comments.
From my point of view this can be merged without the addition of "forcing" webgl2 as this PR has its merit.