refactor(chain,core)!: replace `CanonicalIter` with sans-IO `CanonicalTask` + `ChainQuery` trait #7545

Job	Run time
Rust fmt	14s
prepare	5s
Check no_std	44s
Build & Test (1.75.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	2m 16s
Check WASM	4m 47s
Build & Test (1.88.0, true, --all-features)	3m 43s
Build & Test (1.63.0, --all-features)	6m 2s
Build & Test Examples (example_electrum)	58s
Build & Test (1.88.0, true, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	2m 7s
Build & Test Examples (example_cli)	41s
Build & Test Examples (example_esplora)	55s
Build & Test Examples (example_bitcoind_rpc_polling)	46s
Build & Test (1.63.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	4m 43s
Rust clippy	1m 38s
Build & Test (1.75.0, --all-features)	4m 0s
	33m 39s

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