Support splitting of files and directories in getTimeInfoEntries

[markjm]

Supports the splitting of getTimeInfoEntries between files and directories.
This supports both old and new functionality:

// a complete map of all timestamps, exactly the same as before these changes
const times = w.getTimeInfoEntries()

// filling in of two seperate maps for files and directories
const files = new Map();
const directories = new Map();
w.getTimeInfoEntries(files, directories)

As a small note, the caching present in old mechanism is removed. From my investigation, it doesnt actually block out much computation (since we still need to do the map merging one recursion-level up). The caching also would not provide any benefit in the new mechanism, as we need to do the same number of map additions regardless.

Given these changes, we can incorporate into webpack by changing using the new map-passing pattern here. I have those changes all ready to go, and all webpack-side watching tests are passing with my linked version of these changes.
https://github.com/webpack/webpack/blob/c181294865dca01b28e6e316636fef5f2aad4eb6/lib/node/NodeWatchFileSystem.js#L81

[markjm]

Azure Pipelines tests all pass, but need permissions for Travis-CI

[codecov]

Codecov Report

Merging #205 (4c9c76f) into main (e71b62b) will increase coverage by 1.41%.
The diff coverage is 94.73%.

❗ Current head 4c9c76f differs from pull request most recent head 8d14e94. Consider uploading reports for the commit 8d14e94 to get more accurate results

@@            Coverage Diff             @@
##             main     #205      +/-   ##
==========================================
+ Coverage   91.38%   92.80%   +1.41%     
==========================================
  Files           6        6              
  Lines        1068     1014      -54     
  Branches      257      239      -18     
==========================================
- Hits          976      941      -35     
+ Misses         92       73      -19     

Flag	Coverage Δ
integration	92.80% <94.73%> (+1.41%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
lib/DirectoryWatcher.js	92.74% <90.00%> (+1.08%)	⬆️
lib/watchpack.js	95.87% <100.00%> (+4.36%)	⬆️

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[markjm]

Thanks @vankop for queuing - I foolishly left an it.only call in there - hence the huge loss of coverage. Fixed in latest push (force push to clean up commit history)

[sokra]

Thanks