Provide minified style spec, and use it where applicable

[ahocevar]

Alternative to #11628, as suggested by @mourner.

The @mapbox/mapbox-gl-style-spec package now exports a minified style spec without docs and examples as latestWithoutDocsAndExamples.

Launch Checklist

• briefly describe the changes in this PR (see above)
• include before/after visuals or gifs if this PR includes visual changes (n/a)
• write tests for all new functionality (n/a)
• document any changes to public APIs (no changes)
• post benchmark scores (n/a)
• manually test the debug page
• tagged @mapbox/map-design-team @mapbox/static-apis if this PR includes style spec API or visual changes
• tagged @mapbox/gl-native if this PR includes shader changes or needs a native port (none)
• apply changelog label ('bug', 'feature', 'docs', etc) or use the label 'skip changelog'
• add an entry inside this element for inclusion in the mapbox-gl-js changelog: <changelog></changelog>