fix: add op's extension to signature check in `resolve_opaque_op` #1392

Job	Run time
Check for changes in Rust files	5s
tests (Rust stable, no features)	1m 6s
Build benchmarks 🏋️	5m 28s
check	1m 10s
tests (Rust stable, all features)	1m 13s
tests (Rust 1.75)	1m 45s
tests (Rust beta)	1m 57s
tests (Rust nightly)	1m 26s
Required checks 🦀	1s
coverage	2m 6s
	16m 17s

Provide feedback