Add ShareType enum matching Nextcloud values

Signed-off-by: Claudio Cambra <developer@claudiocambra.com>

Author: claucambra

Sources/NextcloudFileProviderKit/Sharing/ShareType.swift

@@ -0,0 +1,16 @@
+//
+//  ShareType.swift
+//  NextcloudFileProviderKit
+//
+//  Created by Claudio Cambra on 28/4/25.
+//
+
+public enum ShareType: Int {
+    case user = 0
+    case group = 1
+    case publicLink = 3
+    case email = 4
+    case federatedCloudShare = 6
+    case circle = 7
+    case talkConversation = 10
+}