Formatter for cmake

**Formatter tool**
[cmake-format](https://github.com/cheshirekow/cmake_format)

**Filetype(s)**
.cmake Files

**Additional context**
None.

The issue names cmake-format and .cmake files but does not identify implementation files or tests. Start by reviewing the repository's existing formatter integrations and how they register file types; done means cmake-format support works for .cmake files.

Written by the indexing model from the issue text.