Add `Wallet::list_output` method #4348

Job	Run time
clippy_check	37s
Check no_std	32s
Build and test (stable, true, --no-default-features)	1m 53s
Check WASM	44s
Build and test (stable, true, --all-features)	2m 27s
Rust fmt	16s
Build and test (1.57.0, --no-default-features)	2m 58s
Build and test (1.57.0, --all-features)	3m 17s
	12m 44s

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