Introduce forceSyncUpdate to class component

[zhantx]

Summary

As described in issue #28897, there is currently no reliable API for a class component to be updated in SyncLane. This API is desired when a class component is subscribed to an external store, e.g. mobx.

Function component can achieve this reliably by using useSyncExternalStore. However, class component may be updated at an arbitrary time.

How did you test this change?

No implement at the moment

[react-sizebot]

Comparing: d779eba...cec73c1

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.66 kB	6.66 kB	=	1.82 kB	1.82 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.67 kB	6.67 kB	=	1.83 kB	1.83 kB
facebook-www/ReactDOM-prod.classic.js	+0.07%	591.11 kB	591.50 kB	+0.02%	103.94 kB	103.96 kB
facebook-www/ReactDOM-prod.modern.js	+0.07%	567.33 kB	567.73 kB	+0.03%	100.34 kB	100.37 kB
test_utils/ReactAllWarnings.js	Deleted	64.26 kB	0.00 kB	Deleted	16.02 kB	0.00 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable-semver/react/cjs/react.development.js	+1.66%	93.48 kB	95.03 kB	+0.36%	25.60 kB	25.69 kB
oss-stable/react/cjs/react.development.js	+1.66%	93.50 kB	95.05 kB	+0.37%	25.63 kB	25.72 kB
oss-experimental/react/cjs/react.development.js	+1.63%	95.17 kB	96.72 kB	+0.40%	26.01 kB	26.11 kB
facebook-react-native/react/cjs/React-dev.js	+1.37%	113.13 kB	114.68 kB	+0.35%	29.43 kB	29.53 kB
facebook-www/React-dev.modern.js	+1.33%	116.14 kB	117.69 kB	+0.34%	30.11 kB	30.21 kB
facebook-www/React-dev.classic.js	+1.33%	116.63 kB	118.18 kB	+0.34%	30.22 kB	30.32 kB
oss-stable-semver/react/cjs/react.production.js	+1.07%	16.87 kB	17.05 kB	+0.48%	4.39 kB	4.41 kB
oss-stable/react/cjs/react.production.js	+1.07%	16.89 kB	17.07 kB	+0.43%	4.42 kB	4.44 kB
oss-experimental/react/cjs/react.production.js	+1.00%	18.01 kB	18.20 kB	+0.41%	4.68 kB	4.70 kB
facebook-react-native/react/cjs/React-prod.js	+0.83%	21.88 kB	22.06 kB	+0.30%	5.74 kB	5.75 kB
facebook-react-native/react/cjs/React-profiling.js	+0.81%	22.32 kB	22.50 kB	+0.33%	5.81 kB	5.83 kB
facebook-www/React-prod.modern.js	+0.80%	22.68 kB	22.86 kB	+0.39%	5.84 kB	5.86 kB
facebook-www/React-prod.classic.js	+0.80%	22.68 kB	22.86 kB	+0.38%	5.84 kB	5.86 kB
facebook-www/React-profiling.modern.js	+0.78%	23.12 kB	23.30 kB	+0.39%	5.92 kB	5.94 kB
facebook-www/React-profiling.classic.js	+0.78%	23.12 kB	23.30 kB	+0.37%	5.92 kB	5.94 kB
test_utils/ReactAllWarnings.js	Deleted	64.26 kB	0.00 kB	Deleted	16.02 kB	0.00 kB

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