refactor(chain)!: generalize `ChainQuery` trait with generic type #297

Job	Run time
prepare	5s
Rust fmt	14s
Rust clippy	1m 16s
Check no_std	42s
Check WASM	2m 43s
Build & Test (1.88.0, true, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	2m 51s
Build & Test Examples (example_bitcoind_rpc_polling)	1m 12s
Build & Test (1.63.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	9m 42s
Build & Test (1.63.0, --all-features)	10m 55s
Build & Test (1.88.0, true, --all-features)	3m 43s
Build & Test Examples (example_esplora)	56s
Build & Test Examples (example_electrum)	58s
Build & Test (1.75.0, --all-features)	4m 7s
Build & Test (1.75.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	2m 20s
Build & Test Examples (example_cli)	39s
	42m 23s

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