[v3.8.5] Don't export spine enums in c++ since they're defined in spine-core.js.

[dumganhar]

And using _enum will generate a different enum format like var TimelineType = { rotate: { value: 0} }; rather than var TimelineType = { rotate: 0 };

And MathUtil should also be defined in spine-core.js which will make better performance. I will do it in another PR.

Re: #17715

Changelog

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• changes public API, and have ensured backward compatibility with deprecated features.
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[github-actions]

✅ Package size is not changed

Interface Check Report

This pull request does not change any public interfaces !