chore(build): switch ts-loader to esbuild-loader speed up webpack

[ghiscoding]

• this is a simple Dev tool but it's supposed to speed up build by at least 30% so we'll take it :)
• from what I can see, the GitHub live demo build was 1m10sec before and it now dropped to 40sec. (that is 75% speed increase, nice)

[codecov]

Codecov Report

Merging #560 (c723069) into master (46af666) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #560   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          229       229           
  Lines        15756     15756           
  Branches      5288      5288           
=========================================
  Hits         15756     15756           

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