feat!: `MakeOpDef` has new `extension` method. #1215

Job	Run time
Check for changes in Rust files	3s
Build benchmarks 🏋️	4m 57s
tests (Rust 1.75)	1m 46s
check	54s
tests (Rust stable, all features)	58s
tests (Rust beta)	1m 44s
tests (Rust nightly)	1m 40s
tests (Rust stable, no features)	1m 6s
Required checks 🦀	1s
coverage	2m 7s
	15m 16s

Provide feedback