feat(chain): Introduce `tx_graph::Update` WIP #5885

Job	Run time
Check WASM	34s
Check no_std	18s
Build and test (stable, true, --no-default-features)	2m 55s
clippy_check	26s
Rust fmt	16s
Build and test (stable, true, --all-features)	3m 17s
Build and test (1.63.0, --no-default-features)	4m 5s
Build and test (1.63.0, --all-features)	4m 11s
Build Examples (example_cli)	32s
Build Examples (example_bitcoind_rpc_polling)	38s
Build Examples (example_electrum)	53s
Build Examples (example_esplora)	54s
Build Examples (wallet_electrum)	1m 1s
Build Examples (wallet_esplora_async)	52s
Build Examples (wallet_esplora_blocking)	45s
Build Examples (wallet_rpc)	26s
	22m 3s

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