Create utils module, move Log class there

BuildConfig class is now only created in the utils module

client/android/utils/build.gradle.kts

@@ -0,0 +1,17 @@
+plugins {
+    id(libs.plugins.android.library.get().pluginId)
+    id(libs.plugins.kotlin.android.get().pluginId)
+}
+
+kotlin {
+    jvmToolchain(17)
+}
+
+android {
+    namespace = "org.amnezia.vpn"
+
+    buildFeatures {
+        // add BuildConfig class
+        buildConfig = true
+    }
+}