Add a Recorder context

[imnasnainaec]

Progress on #2404

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This change is 

[codecov-commenter]

Codecov Report

Patch coverage: 60.00% and no project coverage change.

Comparison is base (f53702e) 62.94% compared to head (c0caed9) 62.94%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2405   +/-   ##
=======================================
  Coverage   62.94%   62.94%           
=======================================
  Files         239      240    +1     
  Lines        8217     8215    -2     
  Branches      506      505    -1     
=======================================
- Hits         5172     5171    -1     
  Misses       2684     2684           
+ Partials      361      360    -1     

Flag	Coverage Δ
backend	73.65% <ø> (ø)
frontend	50.53% <60.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...onents/DataEntry/DataEntryTable/NewEntry/index.tsx	41.17% <ø> (ø)
...omponents/DataEntry/DataEntryTable/RecentEntry.tsx	47.82% <ø> (ø)
src/components/DataEntry/DataEntryTable/index.tsx	61.86% <ø> (-0.12%)	⬇️
...ponents/Pronunciations/PronunciationsComponent.tsx	100.00% <ø> (ø)
src/components/Pronunciations/Recorder.ts	6.25% <0.00%> (ø)
...viewEntries/ReviewEntriesComponent/CellColumns.tsx	63.50% <ø> (ø)
...iesComponent/CellComponents/PronunciationsCell.tsx	0.00% <ø> (ø)
...viewEntriesComponent/Redux/ReviewEntriesReducer.ts	62.50% <0.00%> (ø)
src/components/Pronunciations/AudioRecorder.tsx	20.00% <100.00%> (+6.66%)	⬆️
src/components/Pronunciations/RecorderContext.ts	100.00% <100.00%> (ø)
... and 1 more

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[jasonleenaylor]

My only concern with this is theoretical. We will have a singleton Recorder, and I'm not sure if it could ever get into a bad state after repeated use. If it could then all recording would be broken on all pages and switching pages would not fix it.

Reviewed 23 of 26 files at r1, 3 of 3 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)