feat(specs): add name to series specs

[markov00]

Summary

fix #136

A name prop is now available for each series. This name will be used, if available, on every
legend or tooltip instead of the specId (used as fallback).

<BarSeries
    name={'Count'}
/>
<LineSeries
    name={'Count'}
/>
<AreaSeries
    name={'Count'}
/>

Checklist

Use strikethroughs to remove checklist items you don't feel are applicable to this PR.

• This was checked for cross-browser compatibility, including a check against IE11
• Proper documentation or storybook story was added for features that require explanation or tutorials
• Unit tests were updated or added to match the most common scenarios
• Each commit follows the convention

[codecov-io]

Codecov Report

Merging #142 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #142   +/-   ##
=======================================
  Coverage   92.84%   92.84%           
=======================================
  Files          31       31           
  Lines        1481     1481           
  Branches      163      166    +3     
=======================================
  Hits         1375     1375           
  Misses         92       92           
  Partials       14       14

Impacted Files	Coverage Δ
src/lib/series/specs.ts	100% <ø> (ø)	⬆️
src/lib/series/tooltip.ts	63.15% <100%> (ø)	⬆️
src/lib/series/legend.ts	100% <100%> (ø)	⬆️

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[emmacunningham]

tested locally on Firefox & code LGTM

[markov00]

🎉 This PR is included in version 3.5.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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