[Fizz] Split createRequest into createRequest, createPrerenderRequest and resumeRequest

[sebmarkbage]

Just moving some internal code around again.

I originally encoded what type of work using startRender vs startPrerender. I had intended to do more forking of the work loop but we've decided not to go with that strategy. It also turns out that forking when we start working is actually too late because of a subtle thing where you can call abort before work begins. Therefore it's important that starting the work comes later.

[react-sizebot]

Comparing: ee7f9c9...c4459cb

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.min.js	=	165.63 kB	165.63 kB	=	51.88 kB	51.88 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	=	174.70 kB	174.70 kB	=	54.61 kB	54.61 kB
facebook-www/ReactDOM-prod.classic.js	=	570.44 kB	570.44 kB	=	100.45 kB	100.45 kB
facebook-www/ReactDOM-prod.modern.js	=	554.21 kB	554.21 kB	=	97.61 kB	97.61 kB
oss-stable-semver/react-server/cjs/react-server.production.min.js	+3.20%	25.91 kB	26.74 kB	+1.54%	8.78 kB	8.92 kB
oss-stable/react-server/cjs/react-server.production.min.js	+3.20%	25.91 kB	26.74 kB	+1.54%	8.78 kB	8.92 kB
oss-experimental/react-server/cjs/react-server.production.min.js	+2.96%	27.99 kB	28.82 kB	+1.43%	9.39 kB	9.52 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-server/cjs/react-server.production.min.js	+3.20%	25.91 kB	26.74 kB	+1.54%	8.78 kB	8.92 kB
oss-stable/react-server/cjs/react-server.production.min.js	+3.20%	25.91 kB	26.74 kB	+1.54%	8.78 kB	8.92 kB
oss-experimental/react-server/cjs/react-server.production.min.js	+2.96%	27.99 kB	28.82 kB	+1.43%	9.39 kB	9.52 kB
oss-stable-semver/react-server/cjs/react-server.development.js	+1.43%	150.33 kB	152.48 kB	+0.32%	37.43 kB	37.55 kB
oss-stable/react-server/cjs/react-server.development.js	+1.43%	150.33 kB	152.48 kB	+0.32%	37.43 kB	37.55 kB
oss-experimental/react-server/cjs/react-server.development.js	+1.33%	161.31 kB	163.46 kB	+0.36%	40.12 kB	40.26 kB
oss-experimental/react-dom/cjs/react-dom-server.browser.production.min.js	+1.14%	68.21 kB	68.99 kB	+0.55%	20.89 kB	21.00 kB
oss-experimental/react-dom/umd/react-dom-server.browser.production.min.js	+1.14%	68.34 kB	69.12 kB	+0.53%	21.16 kB	21.27 kB
oss-experimental/react-dom/cjs/react-dom-server.edge.production.min.js	+1.07%	72.67 kB	73.45 kB	+0.57%	22.38 kB	22.51 kB
oss-experimental/react-dom/cjs/react-dom-server.node.production.min.js	+1.00%	72.99 kB	73.72 kB	+0.57%	22.56 kB	22.69 kB
oss-experimental/react-dom/cjs/react-dom-server.browser.development.js	+0.55%	369.45 kB	371.47 kB	+0.15%	82.39 kB	82.52 kB
oss-experimental/react-dom/cjs/react-dom-server.edge.development.js	+0.55%	369.86 kB	371.88 kB	+0.15%	82.51 kB	82.64 kB
oss-experimental/react-dom/cjs/react-dom-server.node.development.js	+0.54%	370.75 kB	372.76 kB	+0.14%	82.71 kB	82.83 kB
oss-experimental/react-dom/umd/react-dom-server.browser.development.js	+0.54%	387.07 kB	389.16 kB	+0.17%	83.28 kB	83.42 kB
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.min.js	=	1.31 kB	1.30 kB	=	0.62 kB	0.62 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.min.js	=	1.31 kB	1.30 kB	=	0.62 kB	0.62 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.min.js	=	1.31 kB	1.30 kB	=	0.62 kB	0.62 kB

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