refactor: rename clipboard plugin to clipboard-manager (#400)

plugins/clipboard-manager/ios/Sources/ClipboardPlugin.swift

@@ -0,0 +1,46 @@
+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+import UIKit
+import WebKit
+import Tauri
+import SwiftRs
+
+class ClipboardPlugin: Plugin {
+	@objc public func write(_ invoke: Invoke) throws {
+		let options = invoke.getObject("options")
+		if let options = options {
+			let clipboard = UIPasteboard.general
+			let kind = invoke.getString("kind", "")
+			switch kind {
+				case "PlainText":
+					let text = options["text"] as? String
+					clipboard.string = text
+				default:
+				  invoke.reject("Unknown kind \(kind)")
+					return
+			}
+			invoke.resolve()
+		} else {
+			invoke.reject("Missing `options` input")
+		}
+	}
+
+	@objc public func read(_ invoke: Invoke) throws {
+		let clipboard = UIPasteboard.general
+		if let text = clipboard.string {
+			invoke.resolve([
+				"kind": "PlainText",
+				"options": text
+			])
+		} else {
+			invoke.reject("Clipboard is empty")
+		}
+	}
+}
+
+@_cdecl("init_plugin_clipboard")
+func initPlugin() -> Plugin {
+  return ClipboardPlugin()
+}