Add flag to re-enable deep dynamic chunk optimization

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no (this feature is marked as "experimental" and I hope to make it obsolete again soon. Should it turn out that we need to persist the feature, I will add an additional test)

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

• resolves rollup3.7.2 chunking algorithm introduce tow many js chunks #4802
• resolve vite4 generate double count js chunks than vite3 vitejs/vite#11659

Description

This adds a flag output.experimentalDeepDynamicChunkOptimization. When set to true, it will allow the full dynamic import tracing algorithm to run to potentially create fewer chunks at the cost of performance.
I hope to remove this feature again in a future release if I manage to make the full algorithm fast enough.

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[github-actions]

Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#deep-dynamic-chunk-optimization

or load it into the REPL:
https://deploy-preview-4837--rollupjs.netlify.app/repl/?pr=4837

[codecov]

Codecov Report

Merging #4837 (1f3d7d8) into master (5368e80) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4837   +/-   ##
=======================================
  Coverage   98.99%   98.99%           
=======================================
  Files         219      219           
  Lines        7877     7883    +6     
  Branches     2181     2184    +3     
=======================================
+ Hits         7798     7804    +6     
  Misses         26       26           
  Partials       53       53           

Impacted Files	Coverage Δ
src/utils/options/mergeOptions.ts	100.00% <ø> (ø)
src/Bundle.ts	100.00% <100.00%> (ø)
src/ast/variables/LocalVariable.ts	96.10% <100.00%> (+0.15%)	⬆️
src/utils/chunkAssignment.ts	100.00% <100.00%> (ø)
src/utils/options/normalizeOutputOptions.ts	100.00% <100.00%> (ø)

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[rollup-bot]

This PR has been released as part of rollup@3.14.0. You can test it via npm install rollup.