feat(utxo-core): export derive from descriptor index

Export derive from descriptor index to make it available to consumers.

Issue: BTC-1966

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

Author: OttoAllmendinger

modules/utxo-core/src/descriptor/index.ts

@@ -1,6 +1,7 @@
 export * from './psbt';
 export * from './address';
 export * from './DescriptorMap';
+export * from './derive';
 export * from './Output';
 export * from './VirtualSize';