Allow `@transform` directive to be applied to properties. #1629

Job	Run time
Run tests	1m 37s
Run JS linters	1m 9s
Check fuzz targets	17s
Check lint and rustfmt	45s
Check rustdoc WASM target	16s
Python tests and maturin build (3.9)	42s
WASM tests	45s
Python tests and maturin build (3.10)	44s
pre-publish checks	0s
Python tests and maturin build (3.11)	49s
Python tests and maturin build (3.12)	41s
All CI stages	1s
pre-publish checks	0s
publish trustfall_filetests_macros	0s
publish trustfall_core	0s
publish python trustfall	0s
publish trustfall_derive	0s
publish trustfall	0s
publish trustfall_stubgen	0s
	7m 46s

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