feat(wallet): add `TxBuilder::replace_tx` #6671

Job	Run time
prepare	3s
Check WASM	58s
Build & Test Examples (example_cli)	33s
Build & Test (1.84.0, true, --no-default-features --features miniscript/no-std)	2m 11s
Check no_std	31s
Build & Test Examples (example_bitcoind_rpc_polling)	36s
Build & Test (1.84.0, true, --all-features)	3m 56s
Build & Test Examples (example_electrum)	52s
Rust clippy	47s
Build & Test (1.63.0, --no-default-features --features miniscript/no-std)	5m 20s
Build & Test Examples (example_esplora)	54s
Build & Test (1.63.0, --all-features)	6m 8s
Rust fmt	11s
Build & Test Examples (example_wallet_electrum)	54s
Build & Test (1.75.0, --no-default-features --features miniscript/no-std)	2m 17s
Build & Test Examples (example_wallet_esplora_async)	1m 2s
Build & Test (1.75.0, --all-features)	3m 53s
Build & Test Examples (example_wallet_esplora_blocking)	54s
Build & Test Examples (example_wallet_rpc)	36s
	32m 36s

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