Implement Chat Deletion Feature

Currently, our chat app does not support the deletion of individual chats. To enhance user experience and provide more control, we need to implement the ability to delete individual chat conversations. This feature should allow users to long-press on a chat, bring up a context menu, and select "Delete" to remove the chat. Please consider implementing this feature in a user-friendly and intuitive manner.

Also Add Confirm Dialog for Chat Deletion

To prevent accidental deletions and give users a chance to confirm their intent, we should implement a confirmation dialog when a user attempts to delete a chat. This dialog should pop up after the user selects "Delete" and ask for confirmation before the chat is removed permanently. Implement this feature to improve the user experience and prevent accidental data loss.