Feature Request: Add shortcut override

[leonardojoau]

JupyterLab’s Advanced Settings can only override existing shortcuts, not create new ones. I’m not certain whether JupySQL even exposes a jupysql:format-sql command for keybindings. By contrast, jupyterlab‑code‑formatter ships its own binding, e.g.:

{
  "shortcuts": [
    {
      "command": "jupyterlab_code_formatter:format",
      "keys": ["Alt Shift F"],
      "selector": ".jp-Notebook"
    }
  ]
}