fix: fsevents integration

[dnalborczyk]

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:

Description

thanks @kzc for digging into this!

ref:
#4300 (comment)
#4300 (comment)

also took the liberty to convert loadFsEvents to an async function

[codecov]

Codecov Report

Merging #4312 (64c96a9) into master (83af3aa) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4312      +/-   ##
==========================================
- Coverage   98.45%   98.44%   -0.02%     
==========================================
  Files         205      205              
  Lines        7314     7316       +2     
  Branches     2083     2084       +1     
==========================================
+ Hits         7201     7202       +1     
  Misses         55       55              
- Partials       58       59       +1     

Impacted Files	Coverage Δ
src/watch/fsevents-importer.ts	66.66% <100.00%> (-8.34%)	⬇️

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[kzc]

I think build-plugins/conditional-fsevents-import should be removed altogether.

Please see: #4300 (comment)