feat!: Share `Extension`s under `Arc`s (#1647) #2662

Job	Run time
Check for changes in Python files	5s
Build HUGR binary	54s
Check serialization schema	13s
check python 3.10	17s
check python 3.13	28s
test python 3.10	23s
test python 3.13	37s
Required checks 🐍	1s
	2m 58s

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