feat(rpc): introduce FilterIter #6564

Job	Run time
prepare	7s
Check no_std	43s
Build and test (1.83.0, true, --no-default-features --features miniscript/no-std)	2m 48s
Check WASM	1m 15s
Build & Test Examples (example_cli)	45s
Build and test (1.83.0, true, --all-features)	4m 5s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	4m 58s
Build & Test Examples (example_bitcoind_rpc_polling)	42s
Build and test (1.63.0, --all-features)	6m 20s
Rust fmt	13s
Build & Test Examples (example_electrum)	56s
Build & Test Examples (example_esplora)	1m 2s
clippy_check	1m 33s
Build & Test Examples (example_wallet_electrum)	55s
Build & Test Examples (example_wallet_esplora_async)	1m 1s
Build & Test Examples (example_wallet_esplora_blocking)	56s
Build & Test Examples (example_wallet_rpc)	41s
	29m 0s

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