Replace html-minifier with html-minifier-terser to remove dependency on uglify and support ES6 and newer

[mellster2012]

• See: [Documentation] Difference between html-minifier-terser and original html-minifier terser/html-minifier-terser#37 and Cannot find module '../lib/utils.js' in esbuild mjmlio/mjml#2132
• Also adds a public method to get the plotted html as a minified string (e.g. to upload to S3)

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 53.84615% with 6 lines in your changes missing coverage. Please review.

Please upload report for BASE (next@997a5cd). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/stats.ts	33.33%	4 Missing ⚠️
src/plotting.ts	71.42%	2 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             next      #10   +/-   ##
=======================================
  Coverage        ?   62.66%           
=======================================
  Files           ?       19           
  Lines           ?     2199           
  Branches        ?      594           
=======================================
  Hits            ?     1378           
  Misses          ?      821           
  Partials        ?        0           

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[chunkai1312]

Please update to the latest version.

[mellster2012]

Done - thanks!