feat(wallet): add functions to lock and unlock utxos #1368

Job	Run time
Check no_std	34s
Build and test (stable, true, --no-default-features --features miniscript/no-std)	1m 57s
Check WASM	1m 1s
Build & Test Examples (example_cli)	30s
Build and test (stable, true, --all-features)	3m 47s
Build & Test Examples (example_bitcoind_rpc_polling)	31s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	2m 56s
Build & Test Examples (example_electrum)	58s
Build and test (1.63.0, --all-features)	4m 55s
Rust fmt	15s
prepare	5s
Build & Test Examples (example_esplora)	58s
Build & Test Examples (example_wallet_electrum)	51s
Build & Test Examples (example_wallet_esplora_async)	59s
Build & Test Examples (example_wallet_esplora_blocking)	57s
Build & Test Examples (example_wallet_rpc)	41s
clippy_check	38s
	22m 33s

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