Return outputs of frost_shares_gen on jni

jni/src/main/kotlin/fr/acinq/secp256k1/NativeSecp256k1.kt

@@ -145,10 +145,27 @@ public object NativeSecp256k1 : Secp256k1 {
             totalSigners,
             ids33
         )
+        val shares = Array(totalSigners) { index ->
+            val startIndex = 0 + (index*32);
+            val endIndex = 32 + (index*32);
+
+            result.sliceArray(
+                startIndex..endIndex
+            )
+        }
+
+        val vssCommitment = Array(totalSigners) { index ->
+            val startIndex = 0 + (index*65);
+            val endIndex = 65 + (index*65);
+
+            result.sliceArray(
+                startIndex..endIndex
+            )
+        }
 
         return Triple(
-            emptyArray(),
-            emptyArray(),
+            shares,
+            vssCommitment,
             pok64
         )
     }