perf(renderComponent): drop FelaTheme and use React.Context directly

[layershifter]

This PR implements findings from #1106.

Goal

We want to get rid of FelaTheme as it produces two components in the tree and slow downs rendering.

How

We have two use cases for renderComponent(): UIComponent and createComponent().

createComponent() allows to use only functions, so we can use useContext() hook.
UIComponent is a class component, we can't use hooks inside them, but there is Class.contextType that can be adopted for this case.

Measures

See for more details #1106. Raw measures ContextUse and ContextClassField are proposed approaches.

Example	Avg	Avg diff	Median	Median diff
ContextUse.perf.tsx	44.76	+2.22%	38.98	38.98
ContextConsumer.perf.tsx	52.94	+20.9%	48.01	+23.17%
ContextClassConsumer.perf.tsx	63.73	+45.54%	58.06	+48.95%
ContextClassField.perf.tsx	55.79	+27.4%	51.22	+31.4%

From real life

I used #1006 to compare.

⚛ App [mount]697.1149999881163
⚛ App [mount]735.6550000258721
⚛ App [mount]727.5300000328571
⚛ App [mount]706.754999991972

⚛ App [mount]652.7350000105798
⚛ App [mount]602.1899999468587
⚛ App [mount]626.8550000386313
⚛ App [mount]630.9650000184774

Savings are 70-100ms.

[codecov]

Codecov Report

Merging #1163 into master will increase coverage by 0.01%.
The diff coverage is 96.77%.

@@            Coverage Diff             @@
##           master    #1163      +/-   ##
==========================================
+ Coverage   82.46%   82.47%   +0.01%     
==========================================
  Files         740      740              
  Lines        8753     8754       +1     
  Branches     1171     1170       -1     
==========================================
+ Hits         7218     7220       +2     
  Misses       1519     1519              
+ Partials       16       15       -1

Impacted Files	Coverage Δ
packages/react/src/lib/createComponent.tsx	100% <100%> (ø)	⬆️
packages/react/src/lib/UIComponent.tsx	92.3% <100%> (+0.64%)	⬆️
packages/react/src/lib/renderComponent.tsx	93.05% <95.83%> (+0.95%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0ba5c0d...9721629. Read the comment docs.

[kuzhelov]

👍

[kuzhelov]

please, just update the CHANGELOG before merging 👍