inspector - option to clear log

when running `lsp-devtools inspector`, it includes messages from previous runs, which makes it difficult find the first message from the current session. it would be nice if there was a button to clear the log, similar to this button in firefox's devtools:

<img width="411" height="194" alt="Image" src="https://github.com/user-attachments/assets/b2b5db0c-d699-409e-badf-5f1fdb522f48" />