feat: add webpack configuration for wasm-utxo

Configure webpack to use the ESM build of wasm-utxo and add extension alias
to properly resolve TypeScript files.

Ticket: BTC-0

TICKET: BTC-0

Author: lcovar

webpack/bitgojs.config.js

@@ -14,8 +14,13 @@ module.exports = {
       '@hashgraph/sdk': path.resolve('../../node_modules/@hashgraph/sdk/src/browser.js'),
       // use the default version here since we're webpacking ourselves
       '@bitgo/sdk-api': path.resolve('../sdk-api/dist/src/index.js'),
+      // Use ESM build for wasm-utxo (modern ESM-first package)
+      '@bitgo/wasm-utxo': path.resolve('../../node_modules/@bitgo/wasm-utxo/dist/esm/index.js'),
       async: path.resolve('../../node_modules/async/index.js'),
     },
+    extensionAlias: {
+      '.js': ['.js', '.ts'],
+    },
     fallback: {
       constants: false,
       crypto: require.resolve('crypto-browserify'),