HasteFS file size

[jeysal]

Summary

This PR adds a file size field to the haste map file metadata and exposes hasteFS.getSize(path).
It also updates TestSequencer to use the file size data from the hasteFS instead of statSyncing on its own.
This will become more important if the number of file size checks increases because of #7553.
cc @SimenB @cpojer @rubennorte

The "low-level" internals like HasteMap are pretty new to me, I'd appreciate a review from someone familiar with it who knows what implications this change could have :) e.g. what happens with existing serialized haste maps? Is this breaking?
And this will certainly need approval from someone from FB.

Test plan

Added e2e test haste_map_size similar to haste_map_sha1. TestSequencer still works.

[codecov-io]

Codecov Report

Merging #7580 into master will decrease coverage by <.01%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master    #7580      +/-   ##
==========================================
- Coverage   67.99%   67.99%   -0.01%     
==========================================
  Files         248      248              
  Lines        9490     9494       +4     
  Branches        6        5       -1     
==========================================
+ Hits         6453     6455       +2     
- Misses       3035     3037       +2     
  Partials        2        2

Impacted Files	Coverage Δ
packages/jest-haste-map/src/HasteFS.js	50% <0%> (-3.58%)	⬇️
packages/jest-cli/src/TestSequencer.js	100% <100%> (ø)	⬆️
packages/jest-haste-map/src/crawlers/node.js	94.73% <100%> (+0.07%)	⬆️
packages/jest-haste-map/src/index.js	93.56% <100%> (ø)	⬆️
packages/jest-haste-map/src/crawlers/watchman.js	95.55% <100%> (+0.04%)	⬆️

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[mjesun]

Overall it looks good to me. I noticed the watchman integration is also done, so I'm happy with it. We can release an alpha with this once merged and then test it internally (cc @rubennorte).

[jeysal]

Rebased on master

[jeysal]

Alright, should be ready for merge then :)

[cpojer]

This is great work, thanks for doing this and going for the proper, long fix!

[github-actions]

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