Mix colors through CIE LAB color space

[omgovich]

I was trying to mimic the CSS drafts in the previous version, but produced mixtures look weird since the hue interpolation logic, so I switched the space for mixing to CIE LAB which produces better results.

[codecov-commenter]

Codecov Report

Merging #37 (8dbca33) into master (7211974) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #37   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           31        32    +1     
  Lines          391       395    +4     
  Branches        84        84           
=========================================
+ Hits           391       395    +4     

Impacted Files	Coverage Δ
src/manipulate/mix.ts	100.00% <100.00%> (ø)
src/plugins/mix.ts	100.00% <100.00%> (ø)

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[github-actions[bot]]

Size Change: -78 B (-1%)

Total Size: 8.36 kB

Filename	Size	Change
./dist/plugins/mix.js	960 B	-78 B (-8%)	✅

ℹ️ View Unchanged

| Filename | Size | Change | | :--- | :---: | :---: | | `./dist/index.js` | 1.78 kB | 0 B | | `./dist/plugins/a11y.js` | 456 B | 0 B | | `./dist/plugins/hwb.js` | 613 B | 0 B | | `./dist/plugins/lab.js` | 1.03 kB | 0 B | | `./dist/plugins/lch.js` | 1.33 kB | 0 B | | `./dist/plugins/names.js` | 1.36 kB | 0 B | | `./dist/plugins/xyz.js` | 830 B | 0 B |

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