Adds support for targeted messages that only a specific recipient can see in a conversation.

Usage

// Target the sender from context
await send(new MessageActivity('Only you see this').withTargetedRecipient(true));

// Target a specific user
await send(new MessageActivity('Private').withTargetedRecipient('user-id'));

Key Changes

• SDK appends ?isTargetedActivity=true to API calls, so backend services handles the messages accordingly
• Supports create, update, delete, and reply operations
• Includes tests and example bot