Set terrain from diff

[HarelM]

Launch Checklist

Fixes #3463 - add support for terrain in diff

• When updating the style with diff:true and terrain change the map doesn't change #3463

This depends on the following PR to be merged and published first:

• Add terrain diff maplibre-style-spec#460

Also added some types to pick method.

• 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-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (b25764e) 85.88% compared to head (e707f46) 85.90%.

Files	Patch %	Lines
src/style/style.ts	95.94%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3515      +/-   ##
==========================================
+ Coverage   85.88%   85.90%   +0.02%     
==========================================
  Files         244      244              
  Lines       48174    48213      +39     
  Branches     5126     5147      +21     
==========================================
+ Hits        41374    41418      +44     
+ Misses       6800     6795       -5     

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[HarelM]

The 3 missing lines in the coverage report are related to a situation where the diffStyle function from the style spec package returns a different operation than expected.
I'm not sure it's worth the extra effort of trying to mock the diffStyle method in order to cover this code, it's mostly a safeguard.

This is now ready for review.