feat(mdx): add markdown.crossCompilerCache for speed up build process
#2256
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Summary
Reduce 13% time
before
after
Related Issue
https://github.com/facebook/docusaurus/blob/45065e8d2b5831117b8d69fec1be28f5520cf105/packages/docusaurus-mdx-loader/src/createMDXLoader.ts#L36
Checklist