Rust

Migrate custom error trait impls to `thiserror` #5431

Job	Run time
Cargo fmt	20s
Check unused dependencies	46s
Cargo check	2m 40s
Cargo clippy	3m 8s
Cargo clippy (WASM)	1m 35s
Cargo check (WASM)	1m 48s
Check documentation and run doc tests	2m 24s
Test (no_std)	1s
Test (Native)	1s
Test (Light Client)	1s
Test chainhead backend	1s
Test (WASM)	1s
	12m 46s

Provide feedback