Update LND, Aperture, and Taproot Assets to revisions using the
btcd v2 modules, and update lndclient to v0.21.0-3. Migrate Loop
chain, transaction, and address types to their corresponding v2
packages.
The lndclient release includes the migration from:
https://github.com/lightninglabs/lndclient/pull/280
Taproot Assets is temporarily replaced with its btcd v2 revision
because the v0.8 release branch has not adopted the new modules.
This raises the minimum Go version to 1.26 and changes exported
address types.
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
