[Feature] detect `.cmake.in` files as cmake files automatically

### Request Overview

Typically cmake projects have at least 1 `.cmake.in` template file to produce `config.cmake.in`, so those file are common.
would be nice if those can be autodetected as cmake files to apply syntax highligting.

Selecting `cmake` in the bar on the bottom manually works as a workaround.

### Additional Information

_No response_