Add changelog for 19.1.0

[mattcarrollcode]

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[react-sizebot]

Comparing: deb7859...42174e3

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	=	6.68 kB	6.68 kB	+0.05%	1.83 kB	1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	515.13 kB	515.13 kB	=	91.78 kB	91.78 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	=	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	615.31 kB	615.31 kB	=	108.87 kB	108.87 kB
facebook-www/ReactDOM-prod.classic.js	=	647.04 kB	647.04 kB	=	114.37 kB	114.37 kB
facebook-www/ReactDOM-prod.modern.js	=	637.32 kB	637.32 kB	=	112.79 kB	112.79 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

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