feat: saveToken plugin for app groups on iOS

This will allow the share extension to access the Bearer token to send
images to the backend.

tauri-plugin-ios-shared-token/ios/.gitignore

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+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/
+DerivedData/
+.swiftpm/config/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc
+Package.resolved

tauri-plugin-ios-shared-token/ios/Package.swift

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+// swift-tools-version:5.3
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "tauri-plugin-ios-shared-token",
+    platforms: [
+        .macOS(.v10_13),
+        .iOS(.v13),
+    ],
+    products: [
+        // Products define the executables and libraries a package produces, and make them visible to other packages.
+        .library(
+            name: "tauri-plugin-ios-shared-token",
+            type: .static,
+            targets: ["tauri-plugin-ios-shared-token"]),
+    ],
+    dependencies: [
+        .package(name: "Tauri", path: "../.tauri/tauri-api")
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        .target(
+            name: "tauri-plugin-ios-shared-token",
+            dependencies: [
+                .byName(name: "Tauri")
+            ],
+            path: "Sources")
+    ]
+)

tauri-plugin-ios-shared-token/ios/README.md

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+# Tauri Plugin ios-shared-token
+
+A description of this package.

tauri-plugin-ios-shared-token/ios/Sources/SharedToken.swift

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+import SwiftRs
+import Tauri
+import UIKit
+import WebKit
+
+class SaveTokenArgs: Decodable {
+    var token: String?
+}
+
+let appGroupID = "group.com.haystack.com"
+let sharedTokenKey = "sharedAuthToken"
+
+class SharedToken: Plugin {
+    @objc func saveToken(_ invoke: Invoke) throws {
+        guard let args = try? invoke.parseArgs(SaveTokenArgs.self), let token = args.token else {
+            invoke.reject("Missing token argument")
+            return
+        }
+
+        // Access shared UserDefaults
+        guard let sharedDefaults = UserDefaults(suiteName: appGroupID) else {
+            invoke.reject("Could not access shared UserDefaults. Check App Group configuration.")
+            return
+        }
+
+        sharedDefaults.set(token, forKey: sharedTokenKey)
+        invoke.resolve()
+    }
+}
+
+@_cdecl("init_plugin_ios_shared_token")
+func initPlugin() -> Plugin {
+  return SharedToken()
+}

tauri-plugin-ios-shared-token/ios/Tests/PluginTests/PluginTests.swift

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+import XCTest
+@testable import ExamplePlugin
+
+final class ExamplePluginTests: XCTestCase {
+    func testExample() throws {
+        let plugin = ExamplePlugin()
+    }
+}