Use PyIterator type for more idiomatic shim code. (#672) #1680

Job	Run time
Run tests	1m 13s
Check fuzz targets	39s
Check lint and rustfmt	30s
Run JS linters	58s
Check rustdoc WASM target	17s
WASM tests	1m 39s
Python tests and maturin build (3.9)	54s
pre-publish checks	9s
Python tests and maturin build (3.10)	55s
Python tests and maturin build (3.11)	1m 0s
Python tests and maturin build (3.12)	1m 4s
Python tests and maturin build (3.13.0-rc - 3.13)	1m 15s
All CI stages	1s
pre-publish checks	1s
publish trustfall_filetests_macros / Did version change	4s
publish trustfall_filetests_macros / Semver	0s
publish trustfall_filetests_macros / Publish to crates.io	0s
publish trustfall_core / Did version change	8s
publish trustfall_core / Semver	0s
publish trustfall_core / Publish to crates.io	0s
publish python trustfall / Did version change	4s
publish trustfall_derive / Did version change	6s
publish python trustfall / linux	0s
publish python trustfall / windows	0s
publish python trustfall / musllinux	0s
publish python trustfall / macos	0s
publish python trustfall / tag the version	0s
publish python trustfall / publish python trustfall	0s
publish trustfall_derive / Semver	0s
publish trustfall_derive / Publish to crates.io	0s
publish trustfall / Did version change	7s
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
	11m 9s

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