feat: add resolvedBy field to ResolvedId

[TrickyPi]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

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

List any relevant issue numbers:
resolves #4773

Description

[codecov]

Codecov Report

Merging #4789 (aef4368) into master (ade0ee3) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4789      +/-   ##
==========================================
- Coverage   99.03%   99.02%   -0.02%     
==========================================
  Files         217      217              
  Lines        7773     7780       +7     
  Branches     2158     2161       +3     
==========================================
+ Hits         7698     7704       +6     
  Misses         24       24              
- Partials       51       52       +1     

Impacted Files	Coverage Δ
src/ModuleLoader.ts	99.57% <100.00%> (-0.43%)	⬇️
src/utils/PluginDriver.ts	100.00% <100.00%> (ø)
src/utils/resolveId.ts	95.23% <100.00%> (+1.90%)	⬆️
src/utils/resolveIdViaPlugins.ts	100.00% <100.00%> (ø)

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[lukastaegert]

Thanks a lot! Besides the comments I added, it would be nice to also update the documentation. I think this.resolve would be a good place to document it, but it should also be mentioned in resolveId that you can return a resolved field and what the effect is (it changes the return value in this.resolve). Also, we need to update the types in the documentation in at least these two places (not sure if there is another place where the ResolvedId type is used). Thanks for your hard work!

[lukastaegert]

This PR has been released as part of rollup@3.10.0. You can test it via npm install rollup.