Implement `@transform` IR generation in the frontend. #1603

Job	Run time
Check lint and rustfmt	33s
Check fuzz targets	14s
Check rustdoc WASM target	10s
Run JS linters	27s
Run tests	45s
pre-publish checks	0s
WASM tests	0s
Python tests and maturin build	0s
All CI stages	1s
pre-publish checks	0s
publish trustfall_filetests_macros	0s
publish trustfall_core	0s
publish trustfall_derive	0s
publish python trustfall	0s
publish trustfall	0s
publish trustfall_stubgen	0s
	2m 10s

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