refactor: use fs.promises in module loader, Part 2

[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

[codecov]

Codecov Report

Merging #4372 (4ef8a2a) into master (4611705) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4372      +/-   ##
==========================================
+ Coverage   98.70%   98.72%   +0.02%     
==========================================
  Files         205      205              
  Lines        7320     7311       -9     
  Branches     2083     2083              
==========================================
- Hits         7225     7218       -7     
+ Misses         35       34       -1     
+ Partials       60       59       -1     

Impacted Files	Coverage Δ
src/ModuleLoader.ts	100.00% <100.00%> (ø)
src/utils/fs.ts	100.00% <100.00%> (+18.18%)	⬆️

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