Eliminate any traces of Java in app

app/src/main/java/com/topjohnwu/magisk/utils/SafetyNetHelper.kt

@@ -0,0 +1,21 @@
+package com.topjohnwu.magisk.utils
+
+interface SafetyNetHelper {
+
+    val version: Int
+
+    fun attest()
+
+    interface Callback {
+        fun onResponse(responseCode: Int)
+    }
+
+    companion object {
+
+        val RESPONSE_ERR = 0x01
+        val CONNECTION_FAIL = 0x02
+
+        val BASIC_PASS = 0x10
+        val CTS_PASS = 0x20
+    }
+}