feat!: Hugrs now keep a `ExtensionRegistry` with their requirements #2787

Job	Run time
Check for changes in Python files	5s
Build HUGR binary	56s
check python 3.10	13s
Check serialization schema	13s
check python 3.13	28s
test python 3.10	25s
test python 3.13	28s
Required checks 🐍	1s
	2m 49s

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