perf(mf): set splitChunks.chunks to async by default if using module federation

[chenjiahan]

Summary

Set splitChunks.chunks to async by default if using moduleFederation.options.

If using chunks: 'all', the PatchSplitChunksPlugin will turn chunks to a function and it is quite slow when there are thousands of modules.

Related Links

#3067
#3102

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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