CMake linting

[lopho]

Summary

SUMMARY: Build "Add CMake linting"

Purpose of change

As mentioned in #46818 this pull adds linting rules for CMake and the appropriate github action to run on changes to CMakeLists.txt files.

Describe the solution

Using this tool: https://github.com/cheshirekow/cmake_format

Albeit still being quite limited in linting capabilities (see cheshirekow/cmake_format#240 / cheshirekow/cmake_format#239), it's the best out there short of rolling our own parser.

What It can do well is:

• checking for correct indentation
• max empty lines
• max line length
• variable naming
• custom function/macro/command naming

What it lacks is:

• upper/lower case for built-in functions
• spacing between function name and parameter list open parens

The formatting part of the tool (cmake-format) supports everything required for a proper style, but the linter (cmake-lint) is still catching up, but issues are open, and the dev has acknowledged them in the tracker as well as documentation pertaining upcoming features.

Overview of all config options:
https://cmake-format.readthedocs.io/en/latest/configuration.html

Currently implemented and future linter rules:
https://cmake-format.readthedocs.io/en/latest/lint-summary.html

Describe alternatives you've considered

None

Testing

Ran the linter as github action and locally.

Additional context

None