feat!: Replace GATs with `impl Iterator` returns (RPITIT) on `HugrView` #2557

Job	Run time
Check for changes in Python files	3s
Check serialization schema	8s
Build HUGR binary	1m 6s
check python 3.10	11s
check python 3.13	21s
test python 3.10	29s
test python 3.13	30s
Required checks 🐍	1s
	2m 49s

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