refactor(chain)!: generalize `ChainQuery` trait with generic type #292

Job	Run time
Rust fmt	15s
prepare	4s
Build & Test (1.63.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	8m 46s
Build & Test (1.75.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	2m 47s
Build & Test Examples (example_esplora)	58s
Check WASM	2m 31s
Build & Test Examples (example_bitcoind_rpc_polling)	1m 9s
Build & Test Examples (example_electrum)	59s
Build & Test (1.88.0, true, --all-features)	3m 41s
Rust clippy	1m 17s
Build & Test Examples (example_cli)	47s
Build & Test (1.88.0, true, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	2m 12s
Build & Test (1.63.0, --all-features)	10m 27s
Build & Test (1.75.0, --all-features)	3m 56s
Check no_std	33s
	40m 22s

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