feat(shell): support opening URLs on mobile (#1319)

* feat(shell): support opening URLs on mobile

closes #595

* Update and rename StorePlugin.swift to ShellPlugin.swift

* unwrap

* fix func name (ios)

* use undeprecated func if avail

---------

Co-authored-by: fabianlars <fabianlars@fabianlars.de>

plugins/shell/android/src/main/java/ShellPlugin.kt

@@ -0,0 +1,30 @@
+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+package app.tauri.shell
+
+import android.app.Activity
+import android.content.Intent
+import android.net.Uri
+import app.tauri.annotation.Command
+import app.tauri.annotation.TauriPlugin
+import app.tauri.plugin.Invoke
+import app.tauri.plugin.Plugin
+import java.io.File
+
+@TauriPlugin
+class ShellPlugin(private val activity: Activity) : Plugin(activity) {
+    @Command
+    fun open(invoke: Invoke) {
+        try {
+            val url = invoke.parseArgs(String::class.java)
+            val intent = Intent(Intent.ACTION_VIEW, Uri.parse(url))
+            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            activity?.applicationContext?.startActivity(intent)
+            invoke.resolve()
+        } catch (ex: Exception) {
+            invoke.reject(ex.message)
+        }
+    }
+}