What does this PR do?

Adds comprehensive Gmail email management actions and triggers for complete workflow automation.

Explain How the Feature Works

Implements 8 new email actions (reply, archive, delete, label management) and 4 new triggers (starred emails, conversations, attachments, labels) with advanced filtering and real-time detection using Gmail API.

Relevant User Scenarios

• Automated customer support email workflows
• Email organization and labeling automation
• Attachment processing pipelines
• Project-based email management
• Email compliance and monitoring

Fixes #8072 /claim #8072