feat(wallet): add `TxBuilder::replace_tx` #6637

Job	Run time
prepare	3s
Check no_std	46s
Check WASM	1m 6s
Build and test (1.83.0, true, --no-default-features --features miniscript/no-std)	2m 14s
Build & Test Examples (example_cli)	36s
Build and test (1.83.0, true, --all-features)	3m 44s
Build & Test Examples (example_bitcoind_rpc_polling)	36s
clippy_check	1m 20s
Rust fmt	17s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	4m 36s
Build & Test Examples (example_electrum)	1m 7s
Build and test (1.63.0, --all-features)	6m 16s
Build & Test Examples (example_esplora)	54s
Build & Test Examples (example_wallet_electrum)	50s
Build & Test Examples (example_wallet_esplora_async)	1m 4s
Build & Test Examples (example_wallet_esplora_blocking)	57s
Build & Test Examples (example_wallet_rpc)	38s
	27m 4s

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