feat!: Replace GATs with `impl Iterator` returns (RPITIT) on `HugrView` #2559

Job	Run time
Check for changes in Python files	4s
check python 3.10	12s
check python 3.13	24s
Build HUGR binary	1m 2s
Check serialization schema	15s
test python 3.10	37s
test python 3.13	26s
Required checks 🐍	1s
	3m 1s

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