refactor(chain)!: use Amount for DescriptorExt::dust_value() #1396

Job	Run time
Check no_std	11s
Build and test (stable, true, --no-default-features --features miniscript/no-std)	1m 27s
Build & Test Examples (example_cli)	10s
Check WASM	35s
Build and test (stable, true, --all-features)	3m 45s
Build & Test Examples (example_bitcoind_rpc_polling)	37s
Rust fmt	10s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	2m 2s
Build & Test Examples (example_electrum)	51s
prepare	2s
Build and test (1.63.0, --all-features)	4m 54s
Build & Test Examples (example_esplora)	51s
Build & Test Examples (example_wallet_electrum)	52s
Build & Test Examples (example_wallet_esplora_async)	57s
Build & Test Examples (example_wallet_esplora_blocking)	55s
Build & Test Examples (example_wallet_rpc)	34s
clippy_check	31s
	19m 24s

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