refactor(chain)!: use Amount for DescriptorExt::dust_value() #1399

Job	Run time
Build & Test Examples (example_cli)	19s
Build and test (stable, true, --no-default-features --features miniscript/no-std)	2m 35s
Build & Test Examples (example_bitcoind_rpc_polling)	28s
Build & Test Examples (example_electrum)	47s
Build and test (stable, true, --all-features)	4m 1s
Check no_std	14s
Check WASM	39s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	3m 32s
Build & Test Examples (example_esplora)	50s
Build and test (1.63.0, --all-features)	5m 9s
Build & Test Examples (example_wallet_electrum)	49s
Rust fmt	7s
prepare	3s
Build & Test Examples (example_wallet_esplora_async)	51s
Build & Test Examples (example_wallet_esplora_blocking)	50s
Build & Test Examples (example_wallet_rpc)	30s
clippy_check	1m 36s
	23m 20s

Provide feedback