Rust

Migrate custom error trait impls to `thiserror` #5429

Job	Run time
Cargo fmt	25s
Check unused dependencies	2m 8s
Cargo clippy	1m 26s
Cargo clippy (WASM)	1m 32s
Cargo check (WASM)	1m 38s
Cargo check	1m 27s
Check documentation and run doc tests	1m 28s
Test chainhead backend	1s
Test (Native)	1s
Test (Light Client)	1s
Test (WASM)	1s
Test (no_std)	1s
	10m 9s

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