feat!: `MakeOpDef` has new `extension` method. #1216

Job	Run time
Check for changes in Rust files	3s
Build benchmarks 🏋️	5m 31s
check	50s
tests (Rust 1.75)	1m 42s
tests (Rust stable, all features)	1m 0s
tests (Rust beta)	1m 39s
tests (Rust stable, no features)	1m 10s
tests (Rust nightly)	1m 21s
Required checks 🦀	1s
coverage	2m 26s
	15m 43s

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