refactor(chain)!: use Amount for DescriptorExt::dust_value() #1394

Job	Run time
Check no_std	15s
Check WASM	36s
Build and test (stable, true, --no-default-features --features miniscript/no-std)	1m 42s
Build and test (stable, true, --all-features)	3m 47s
Build & Test Examples (example_cli)	10s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	2m 3s
Rust fmt	12s
Build & Test Examples (example_bitcoind_rpc_polling)	29s
Build and test (1.63.0, --all-features)	4m 42s
Build & Test Examples (example_electrum)	42s
prepare	3s
Build & Test Examples (example_esplora)	51s
Build & Test Examples (example_wallet_electrum)	49s
Build & Test Examples (example_wallet_esplora_async)	57s
Build & Test Examples (example_wallet_esplora_blocking)	45s
Build & Test Examples (example_wallet_rpc)	25s
clippy_check	35s
	19m 3s

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