support loaderContext.getLogger

[JLHwung]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

See original PR #130 for the motivation.

Breaking Changes

Additional Info

Closes #130
Fixes #185
Closes #198
Fixes babel/babel-loader#1043

This PR is based on #130. In this PR we fixed the bug that caused the worker hanging, aligned the less-loader test case with the sass-loader one and incorporated the review comment #185 (comment).

We also bumped babel-loader to 9.2.0, which is also affected by the issue #185.

[linux-foundation-easycla]

• ✅ login: JLHwung / name: Huáng Jùnliàng (ab6fce4, c231bd6, ab9745d, 8d39667, 91829b5)
• ❌ The email address for the commit (eb48870, 34a6d4f) is not linked to the GitHub account, preventing the EasyCLA check. Consult this Help Article and GitHub Help to resolve. (To view the commit's email address, add .patch at the end of this PR page's URL.) For further assistance with EasyCLA, please submit a support request ticket.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 59 lines in your changes missing coverage. Please review.

Project coverage is 19.00%. Comparing base (1bed580) to head (8d39667).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
src/worker.js	0.00%	44 Missing and 1 partial ⚠️
src/WorkerPool.js	0.00%	13 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #216      +/-   ##
==========================================
- Coverage   21.23%   19.00%   -2.23%     
==========================================
  Files           8        8              
  Lines         504      563      +59     
  Branches      108      111       +3     
==========================================
  Hits          107      107              
- Misses        348      405      +57     
- Partials       49       51       +2     

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[alexander-akait]

Thank you