fix(plugin-chart-echarts): include label length in distance calculation

[krsnik93]

🐛 Bug Fix
Fixes labels overlapping axis as reported here: apache/superset#14072 (comment)

Label length (in chars) is now taken into account when calculating distance from axis.

Screenshots:

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[codecov]

Codecov Report

Merging #1056 (d99ca34) into master (6825e87) will increase coverage by 0.02%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master    #1056      +/-   ##
==========================================
+ Coverage   27.80%   27.82%   +0.02%     
==========================================
  Files         453      453              
  Lines        9104     9108       +4     
  Branches     1416     1417       +1     
==========================================
+ Hits         2531     2534       +3     
  Misses       6381     6381              
- Partials      192      193       +1     

Impacted Files	Coverage Δ
...lugins/plugin-chart-echarts/src/Gauge/constants.ts	100.00% <ø> (ø)
...s/plugin-chart-echarts/src/Gauge/transformProps.ts	84.31% <80.00%> (-0.80%)	⬇️

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[villebro]

@krsnik93 this needs a rebase

[krsnik93]

@villebro thanks, done

[krsnik93]

@villebro hello, would you have some time to take a look at this?

[villebro]

LGTM - when there is some spare time let's try to add native support for improved text alignment to the gauge series type in ECharts.