new protocol message

Create a new protocol message by taking the following steps:

1. Define the message type

Add your new message type definition to the appropriate file in the protocol/ directory with correct TypeScript typing.

2. Check for duplicates

Verify that no existing message type already provides the same functionality.

3. Add to passThrough (if webview ↔ core)

If your message is between webview and core, add it to core/protocol/passThrough.ts.

4. Add to IntelliJ constants (if webview ↔ core)

If your message is between webview and core, add it to extensions/intellij/src/main/kotlin/com/github/continuedev/continueintellijextension/constants/MessageTypes.kt.

5. Implement the message handler

Implement the message in the appropriate location:

• Messages to core: core/core.ts
• Messages to GUI: useWebviewListener hook
• Messages to VS Code IDE: VsCodeMessenger.ts
• Messages to JetBrains IDE: IdeProtocolClient.kt

6. Test the implementation

Verify that your message works correctly in both VS Code and JetBrains IDEs if applicable.