feat: honor displayName of context types

[eps1lon]

Summary

New iteration of #18035 which had to be reverted (#18223) since setting Context.Consumer.displayName would throw.

Setting Context.Consumer.displayName ignores the given value but emits warning. As far as I can tell this doesn't do anything on master: https://codesandbox.io/s/priceless-hooks-lm0ky

Test Plan

@trueadm should sign this off since this affects internal tests. If a warning is still too loud we could put it behind a flag that we turn off for the fb builds.

[codesandbox]

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Latest deployment of this branch, based on commit 2176e6d:

Sandbox	Source
ancient-breeze-vjpd0	Configuration
Context.Consumer.displayName	PR

[sizebot]

Details of bundled changes.

Comparing: 3ee812e...2176e6d

react

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react.development.js	+0.7%	+0.5%	99.63 KB	100.31 KB	24.51 KB	24.65 KB	UMD_DEV
react.production.min.js	0.0%	0.0%	11.59 KB	11.59 KB	4.56 KB	4.56 KB	UMD_PROD
react.profiling.min.js	0.0%	0.0%	15.13 KB	15.13 KB	5.67 KB	5.68 KB	UMD_PROFILING
react.development.js	+1.1%	+0.8%	61.49 KB	62.14 KB	16.79 KB	16.92 KB	NODE_DEV
react.production.min.js	0.0%	0.0%	6.53 KB	6.53 KB	2.65 KB	2.65 KB	NODE_PROD
React-dev.js	+0.9%	+0.6%	74.61 KB	75.3 KB	18.95 KB	19.07 KB	FB_WWW_DEV
React-prod.js	0.0%	0.0%	17.69 KB	17.69 KB	4.56 KB	4.56 KB	FB_WWW_PROD
React-profiling.js	0.0%	0.0%	17.69 KB	17.69 KB	4.56 KB	4.56 KB	FB_WWW_PROFILING

React: size: 0.0%, gzip: 0.0%

Size changes (stable)

Generated by 🚫 dangerJS against 2176e6d

[sizebot]

Details of bundled changes.

Comparing: 3ee812e...2176e6d

react

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react.development.js	+0.6%	+0.5%	107.52 KB	108.2 KB	25.72 KB	25.85 KB	UMD_DEV
react.production.min.js	0.0%	0.0%	12.45 KB	12.45 KB	4.8 KB	4.8 KB	UMD_PROD
react.profiling.min.js	0.0%	0.0%	15.98 KB	15.98 KB	5.88 KB	5.88 KB	UMD_PROFILING
react.development.js	+0.9%	+0.6%	69.02 KB	69.67 KB	18 KB	18.11 KB	NODE_DEV
react.production.min.js	0.0%	0.0%	7.5 KB	7.5 KB	2.9 KB	2.9 KB	NODE_PROD
React-dev.js	+0.9%	+0.7%	73.93 KB	74.62 KB	18.77 KB	18.89 KB	FB_WWW_DEV
React-prod.js	0.0%	0.0%	17.63 KB	17.63 KB	4.55 KB	4.55 KB	FB_WWW_PROD
React-profiling.js	0.0%	0.0%	17.63 KB	17.63 KB	4.55 KB	4.55 KB	FB_WWW_PROFILING

React: size: 0.0%, gzip: 0.0%

Size changes (experimental)

Generated by 🚫 dangerJS against 2176e6d

[bvaughn]

This looks better to me, but cc @trueadm to make sure I'm not overlooking something about this internal case.

[bvaughn]

I ran a local sync on this version and verified that the internal test the previous PR broke passes now.