feat!: `used_extensions` calls for both ops and signatures (#1739) #2854

Job	Run time
Check for changes in Python files	4s
Build HUGR binary	59s
check python 3.10	15s
Check serialization schema	8s
check python 3.13	22s
test python 3.10	21s
test python 3.13	23s
Required checks 🐍	1s
	2m 33s

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