Replace various uses of `vec!` with arrays #1064

Job	Run time
Check fuzz targets	51s
Run JS linters	2m 4s
Check lint and rustfmt	59s
Run tests	3m 0s
WASM tests	1m 2s
Python tests and maturin build (3.9)	1m 21s
Python tests and maturin build (3.10)	57s
Python tests and maturin build (3.11)	1m 22s
pre-publish checks	0s
All CI stages	1s
pre-publish checks	0s
publish trustfall_filetests_macros	0s
publish trustfall_core	0s
publish python trustfall	0s
publish trustfall	0s
publish trustfall	0s
publish trustfall_stubgen	0s
	11m 37s

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