Cleanup `Argument` type use by adding `evaluate_statically` method. (… #1572

Job	Run time
Check rustdoc WASM target	17s
Run JS linters	1m 2s
Check lint and rustfmt	38s
Check fuzz targets	31s
Run tests	54s
WASM tests	1m 26s
pre-publish checks	7s
Python tests and maturin build (3.9)	38s
Python tests and maturin build (3.10)	52s
Python tests and maturin build (3.11)	59s
Python tests and maturin build (3.12)	44s
All CI stages	1s
pre-publish checks	1s
publish trustfall_filetests_macros / Did version change	6s
publish trustfall_filetests_macros / Semver	0s
publish trustfall_filetests_macros / Publish to crates.io	0s
publish trustfall_core / Did version change	4s
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publish trustfall_derive / Did version change	4s
publish python trustfall / Did version change	7s
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publish trustfall_derive / Publish to crates.io	0s
publish trustfall / Did version change	5s
publish python trustfall / linux	0s
publish python trustfall / macos	0s
publish python trustfall / windows	0s
publish python trustfall / tag the version	0s
publish python trustfall / publish python trustfall	0s
publish trustfall / Semver	0s
publish trustfall / Publish to crates.io	0s
publish trustfall_stubgen / Did version change	5s
publish trustfall_stubgen / Semver	0s
publish trustfall_stubgen / Publish to crates.io	0s
	8m 41s

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