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/ios/Sources/ShellPlugin.swift

@@ -0,0 +1,34 @@
+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+import Foundation
+
+import SwiftRs
+import Tauri
+import UIKit
+import WebKit
+
+class ShellPlugin: Plugin {
+
+    @objc public func open(_ invoke: Invoke) throws {
+        do {
+            let urlString = try invoke.parseArgs(String.self)
+            if let url = URL(string: urlString) {
+                if #available(iOS 10, *) {
+                    UIApplication.shared.open(url, options: [:])
+                } else {
+                    UIApplication.shared.openURL(url)
+                }
+            }
+            invoke.resolve()
+        } catch {
+            invoke.reject(error.localizedDescription)
+        }
+    }
+}
+
+@_cdecl("init_plugin_shell")
+func initPlugin() -> Plugin {
+  return ShellPlugin()
+}