feat: `instantiate` method for `OpDef` (#1576) #2273

Job	Run time
Check for changes in Python files	4s
Build HUGR binary	38s
Check serialization schema	9s
check python 3.10	12s
check python 3.13	20s
test python 3.10	25s
test python 3.13	46s
Required checks 🐍	1s
	2m 35s

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