feat: tests for ext dtype equality (#1962) #6702

Job	Run time
bench test	11m 43s
Rust build (all-features)	6m 59s
License Check and Audit Check	4m 2s
Rust build (default features)	6m 1s
Check generated proto/fbs files are up to date	42s
Rust build (with tokio dispatcher)	6m 8s
Rust build (with compio dispatcher)	6m 41s
miri	8m 21s
Python (lint)	3m 46s
Rust build (with tokio+compio dispatcher)	6m 9s
Rust build (wasm32 with default features)	2m 37s
Python (test)	5m 12s
Rust (docs)	1m 7s
Rust (lint)	5m 45s
Rust (tests)	6m 18s
	1h 21m 31s

Provide feedback