feat: add group conversation and thread management endpoints (#218)

Author: eirikb

src/endpoints.json

@@ -598,5 +598,23 @@
     "toolName": "search-query",
     "scopes": ["Mail.Read", "Calendars.Read", "Files.Read.All", "People.Read"],
     "workScopes": ["Sites.Read.All", "Chat.Read", "ChannelMessage.Read.All"]
+  },
+  {
+    "pathPattern": "/groups/{group-id}/conversations",
+    "method": "get",
+    "toolName": "list-group-conversations",
+    "workScopes": ["Group.Read.All"]
+  },
+  {
+    "pathPattern": "/groups/{group-id}/threads",
+    "method": "get",
+    "toolName": "list-group-threads",
+    "workScopes": ["Group.Read.All"]
+  },
+  {
+    "pathPattern": "/groups/{group-id}/threads/{conversationThread-id}/reply",
+    "method": "post",
+    "toolName": "reply-to-group-thread",
+    "workScopes": ["Group.ReadWrite.All"]
   }
 ]