Allow `@transform` directive to be applied to properties. #1579

Job	Run time
Check rustdoc WASM target	21s
Check fuzz targets	22s
Check lint and rustfmt	35s
Run JS linters	55s
Run tests	52s
WASM tests	56s
Python tests and maturin build (3.9)	45s
pre-publish checks	0s
Python tests and maturin build (3.10)	47s
Python tests and maturin build (3.11)	38s
Python tests and maturin build (3.12)	47s
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
	6m 59s

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