fix(chain,wallet): Provide unconfirmed spends to chain src sync request #288

Job	Run time
prepare	3s
Check no_std	17s
Check WASM	35s
Build and test (1.83.0, true, --no-default-features --features miniscript/no-std)	1m 28s
Build & Test Examples (example_cli)	23s
Build and test (1.83.0, true, --all-features)	3m 48s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	2m 6s
Build & Test Examples (example_bitcoind_rpc_polling)	34s
clippy_check	27s
Build & Test Examples (example_electrum)	55s
Build and test (1.63.0, --all-features)	4m 55s
Rust fmt	11s
Build & Test Examples (example_esplora)	54s
Build & Test Examples (example_wallet_electrum)	50s
Build & Test Examples (example_wallet_esplora_async)	1m 2s
Build & Test Examples (example_wallet_esplora_blocking)	1m 1s
Build & Test Examples (example_wallet_rpc)	32s
	20m 1s

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