feat(notification): implement Android and iOS APIs (#340)

plugins/notification/android/src/main/java/AssetUtils.kt

@@ -0,0 +1,25 @@
+package app.tauri.notification
+
+import android.annotation.SuppressLint
+import android.content.Context
+
+class AssetUtils {
+  companion object {
+    const val RESOURCE_ID_ZERO_VALUE = 0
+
+    @SuppressLint("DiscouragedApi")
+    fun getResourceID(context: Context, resourceName: String?, dir: String?): Int {
+      return context.resources.getIdentifier(resourceName, dir, context.packageName)
+    }
+
+    fun getResourceBaseName(resPath: String?): String? {
+      if (resPath == null) return null
+      if (resPath.contains("/")) {
+        return resPath.substring(resPath.lastIndexOf('/') + 1)
+      }
+      return if (resPath.contains(".")) {
+        resPath.substring(0, resPath.lastIndexOf('.'))
+      } else resPath
+    }
+  }
+}