setup cmake_format as a proper formatter in VSCode

[jgcodes2020]

Title says all. cmake_format currently uses its own keyboard shortcut, and it'd be nice to have it registered like other formatters, so I can use Alt+Shift+F to format my code.

[cheshirekow]

The vscode extension doesn't setup it's own keybindings, it registers itself as a document formatter. If you have different keybindings formatting cmake code you might have a second cmake extension installed?