feat(wallet)!: add `NonEmptyDatabase` variant to `NewError` #1005

Job	Run time
Check WASM	57s
Check no_std	32s
Build and test (stable, true, --no-default-features)	3m 7s
Build and test (stable, true, --all-features)	3m 28s
Build and test (1.63.0, --no-default-features)	4m 59s
Build and test (1.63.0, --all-features)	5m 11s
clippy_check	28s
Rust fmt	15s
	18m 57s

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