gmail_toolkit integration

Author: waleedalzarooni

camel/toolkits/__init__.py

@@ -37,6 +37,7 @@
 from .github_toolkit import GithubToolkit
 from .google_scholar_toolkit import GoogleScholarToolkit
 from .google_calendar_toolkit import GoogleCalendarToolkit
+from .gmail_toolkit import GmailToolkit
 from .arxiv_toolkit import ArxivToolkit
 from .slack_toolkit import SlackToolkit
 from .whatsapp_toolkit import WhatsAppToolkit
@@ -122,6 +123,7 @@
     'AsyncAskNewsToolkit',
     'GoogleScholarToolkit',
     'GoogleCalendarToolkit',
+    'GmailToolkit',
     'NotionToolkit',
     'ArxivToolkit',
     'HumanToolkit',