refactor(chain)!: generalize `ChainQuery` trait with generic type #315

Job	Run time
Rust fmt	14s
prepare	3s
Build & Test (1.63.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	6m 47s
Check no_std	44s
Build & Test (1.88.0, true, --all-features)	3m 57s
Build & Test (1.88.0, true, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	2m 16s
Build & Test (1.75.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	2m 40s
Check WASM	2m 48s
Build & Test (1.63.0, --all-features)	7m 34s
Build & Test (1.75.0, --all-features)	4m 19s
Build & Test Examples (example_bitcoind_rpc_polling)	59s
Build & Test Examples (example_cli)	1m 0s
Rust clippy	1m 36s
Build & Test Examples (example_esplora)	1m 1s
Build & Test Examples (example_electrum)	1m 8s
	37m 6s

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