LND v0.21 exposes CommitmentType_TAPROOT as the production taproot
channel commitment type, while SIMPLE_TAPROOT remains a legacy taproot
enum. Static address channel opens previously rejected TAPROOT and only
classified SIMPLE_TAPROOT as a taproot output for fee and weight
estimates.
Accept TAPROOT in the static address open-channel validator and keep
accepting SIMPLE_TAPROOT for compatibility. Treat both taproot
commitment enums as P2TR outputs for deposit-selection and withdrawal
fee estimates. Callers using the production enum then get the same
weight accounting as the legacy taproot enum.
This does not change the CLI mapping for user-facing
channel_type=taproot. It only makes the static address path compatible
with callers that already send LND production taproot commitment type.
The Parameters struct describes the keys, expiry and pkScript that
define the static address script, so its natural home is the script
package. Moving it there lets staticutil drop its dependency on the
address package and lets callers reuse a single type alongside
script.StaticAddress and script.NewStaticAddress.
No behavior change.
Closes#1056
