refactor(bdk_hwi)!: remove `bdk_hwi` Cargo.toml #101

Job	Run time
Check no_std	2m 53s
prepare	3s
Build and test (stable, true, --no-default-features)	42s
Build and test (stable, true, --all-features)	41s
Build and test (1.63.0, --no-default-features)	29s
Build and test (1.63.0, --all-features)	26s
Check WASM	3m 25s
Build Examples (example_cli)	41s
Rust fmt	15s
Build Examples (example_bitcoind_rpc_polling)	51s
Build Examples (example_electrum)	1m 2s
Build Examples (example_esplora)	58s
Build Examples (wallet_electrum)	1m 1s
Build Examples (wallet_esplora_async)	1m 12s
Build Examples (wallet_esplora_blocking)	1m 0s
Build Examples (wallet_rpc)	2m 51s
clippy_check	3m 17s
	21m 47s

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