chore: replace mathjs with mexp

[villebro]

🏠 Internal
Replace mathjs (11 Mb bundle) with math-expression-evaluator (71 kb) as done on apache/superset#16701.

Checklist:

• added unit tests to plugins-chart-echart for formula evaluation
• ensure formula annotations work on both NVD3 and ECharts plugin:

NVD3 plugin after migration:

ECharts plugin after migration:

Also fix z-index of formula to make sure it is displayed above other charts:

AFTER

BEFORE

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🔍 Inspect: https://vercel.com/superset/superset-ui/6KH99irRgazeFsRjUDHHyAm89gkf
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[kgabryje]

Lgtm, just remove the console log please 🙂

[codecov]

Codecov Report

Merging #1362 (5109096) into master (4de24d5) will decrease coverage by 0.00%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #1362      +/-   ##
==========================================
- Coverage   30.12%   30.12%   -0.01%     
==========================================
  Files         491      491              
  Lines        9874     9878       +4     
  Branches     1662     1663       +1     
==========================================
+ Hits         2975     2976       +1     
- Misses       6652     6655       +3     
  Partials      247      247              

Impacted Files	Coverage Δ
plugins/legacy-preset-chart-nvd3/src/NVD3Vis.js	0.00% <0.00%> (ø)
...lugin-chart-echarts/src/Timeseries/transformers.ts	44.44% <ø> (ø)
...ugins/plugin-chart-echarts/src/utils/annotation.ts	83.72% <100.00%> (+0.38%)	⬆️

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