[compiler] Provide support for custom fbt-like macro functions

[josephsavona]

Stack from ghstack (oldest at bottom):

• -> [compiler] Provide support for custom fbt-like macro functions #29893

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Name	Status	Preview	Comments	Updated (UTC)
react-compiler-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 14, 2024 0:25am

[josephsavona]

i verified that without the change (and without the @customMacros(cx) pragma) this fixture assigns cx to a local

[mofeiZ]

_soclean!

[react-sizebot]

Comparing: 2ba462b...8d49249

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-stable/react-dom/cjs/react-dom-client.production.js	=	497.80 kB	497.80 kB	=	89.24 kB	89.24 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.67 kB	6.67 kB	+0.11%	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	502.62 kB	502.62 kB	=	89.94 kB	89.94 kB
facebook-www/ReactDOM-prod.classic.js	=	597.04 kB	597.04 kB	=	105.31 kB	105.31 kB
facebook-www/ReactDOM-prod.modern.js	=	571.38 kB	571.38 kB	=	101.25 kB	101.25 kB
test_utils/ReactAllWarnings.js	Deleted	62.88 kB	0.00 kB	Deleted	15.69 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
test_utils/ReactAllWarnings.js	Deleted	62.88 kB	0.00 kB	Deleted	15.69 kB	0.00 kB

Generated by 🚫 dangerJS against 8d49249