feat(utxo-staking): add babylon network type and conversion utils

Add network type definitions and conversion functions between Babylon and
BitcoinJS networks

Issue: BTC-1933

Author: OttoAllmendinger

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

@@ -0,0 +1,34 @@
+import * as bitcoinjslib from 'bitcoinjs-lib';
+import * as utxolib from '@bitgo/utxo-lib';
+
+export type BabylonNetwork = 'mainnet' | 'testnet';
+
+export type BabylonNetworkLike = bitcoinjslib.Network | utxolib.Network | BabylonNetwork;
+
+export function toBabylonNetwork(n: BabylonNetworkLike): BabylonNetwork {
+  switch (n) {
+    case bitcoinjslib.networks.bitcoin:
+    case utxolib.networks.bitcoin:
+      return 'mainnet';
+    case bitcoinjslib.networks.testnet:
+    case utxolib.networks.testnet:
+    case utxolib.networks.bitcoinPublicSignet:
+      return 'testnet';
+    case 'mainnet':
+    case 'testnet':
+      return n;
+    default:
+      throw new Error('Unsupported network');
+  }
+}
+
+export function toBitcoinJsNetwork(n: BabylonNetworkLike): bitcoinjslib.Network {
+  switch (toBabylonNetwork(n)) {
+    case 'mainnet':
+      return bitcoinjslib.networks.bitcoin;
+    case 'testnet':
+      return bitcoinjslib.networks.testnet;
+    default:
+      throw new Error('Unsupported network');
+  }
+}