Handle wide vega charts

[fiskus]

• Rewrite Vega renderer as a functional component
• Add overflow scroll for large charts
• Move dropdown menu to the left, so it doesn't mess with scroll
• Change character width for JsonDisplay so more likely there won't be a horizontal scroll

[codecov]

Codecov Report

Merging #2304 (d9f9142) into master (bc44db4) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2304      +/-   ##
==========================================
+ Coverage   44.02%   44.04%   +0.01%     
==========================================
  Files         485      485              
  Lines       23660    23650      -10     
  Branches     3047     3045       -2     
==========================================
  Hits        10416    10416              
+ Misses      12367    12360       -7     
+ Partials      877      874       -3     

Flag	Coverage Δ
api-python	89.82% <ø> (ø)
catalog	14.51% <0.00%> (+<0.01%)	⬆️
lambda	93.97% <ø> (ø)

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Impacted Files	Coverage Δ
catalog/app/components/JsonDisplay/JsonDisplay.js	0.00% <0.00%> (ø)
catalog/app/components/Preview/renderers/Vega.tsx	0.00% <0.00%> (ø)

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