feat(wallet)!: add `NonEmptyDatabase` variant to `NewError` #1006

Job	Run time
Check WASM	53s
Check no_std	33s
clippy_check	23s
Build and test (stable, true, --no-default-features)	3m 12s
Build and test (stable, true, --all-features)	3m 24s
Rust fmt	13s
Build and test (1.63.0, --no-default-features)	4m 57s
Build and test (1.63.0, --all-features)	5m 8s
	18m 43s

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