Suggest prompts to the user based on the past chat history. AI will generate prompts, therefore insert them first into the input field, so users can verify this is what they want to run.

The suggestion can be potentially implemented via Follow-Ups API.

To insert text into the user prompt field use the `workbench.action.chat.open` with https://github.com/microsoft/vscode/blob/main/src/vs/workbench/contrib/chat/browser/chat.ts#L65