refactor(chain)!: generalize `ChainQuery` trait with generic type #298

Job	Run time
Rust fmt	15s
prepare	6s
Check no_std	35s
Rust clippy	1m 18s
Build & Test (1.88.0, true, --all-features)	3m 43s
Check WASM	6m 31s
Build & Test (1.63.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	9m 41s
Build & Test (1.88.0, true, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	2m 15s
Build & Test (1.63.0, --all-features)	10m 30s
Build & Test Examples (example_bitcoind_rpc_polling)	56s
Build & Test (1.75.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	2m 28s
Build & Test Examples (example_esplora)	54s
Build & Test Examples (example_electrum)	1m 5s
Build & Test Examples (example_cli)	38s
Build & Test (1.75.0, --all-features)	4m 18s
	45m 13s

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