preserve custom metadata when converting between Subxt metadata and frame_metadata #5549

Job	Run time
Cargo fmt	9s
Cargo fmt	9s
Check unused dependencies	36s
Check unused dependencies	36s
Cargo clippy	5m 40s
Cargo clippy	5m 40s
Cargo check	11m 12s
Cargo check	11m 12s
Cargo clippy (WASM)	1m 41s
Cargo clippy (WASM)	1m 41s
Check documentation and run doc tests	7m 4s
Check documentation and run doc tests	7m 4s
Cargo check (WASM)	1m 16s
Cargo check (WASM)	1m 16s
Test (no_std)	1m 56s
Test (no_std)	1m 56s
Test (Native)	6m 11s
Test (Native)	15m 21s
Test (Light Client)	4m 32s
Test (Light Client)	4m 32s
Test chainhead backend	6m 3s
Test chainhead backend	15m 30s
Test (WASM)	6m 24s
Test (WASM)	11m 21s
	2h 9m 2s

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