Add `Wallet::list_output` method #4201

Job	Run time
clippy_check	54s
Check WASM	1m 6s
Build and test (stable, true, --no-default-features)	3m 18s
Build and test (stable, true, --all-features)	5m 18s
Check no_std	50s
Rust fmt	8s
Build and test (1.57.0, --no-default-features)	4m 58s
Build and test (1.57.0, --all-features)	5m 16s
	21m 48s

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