feat(utxo-staking): export sortedKeys function for use in unbonding

Export the sortedKeys function so it can be used in unbonding withdraw flow.

Issue: BTC-2319

Co-authored-by: llm-git <[email protected]>

Author: OttoAllmendinger

modules/utxo-staking/src/babylon/descriptor.ts

@@ -17,7 +17,7 @@ function pk(b: Buffer): ast.MiniscriptNode {
   return { 'v:pk': b.toString('hex') };
 }
 
-function sortedKeys(keys: Buffer[]): Buffer[] {
+export function sortedKeys(keys: Buffer[]): Buffer[] {
   return [...keys].sort((a, b) => a.compare(b));
 }