Add cmake minumum requirements to all CMake files

What is the new feature

Add cmake_minimun_required to all CMake files.
This MR finishes the discussion in !17 (comment 182406)

How is it implemented

Check the required CMake version for each file and add it to the top of the file.

Mandatory steps before review

• Gitlab CI passes (Hint: use make format for linting)
• New feature is covered by additional unit tests
• Mark the merge request as ready by removing Draft:

Mandatory steps before merge

• Reviewed by a maintainer
• Incorporate review suggestions

You are not supposed to merge this request by yourself, the maintainers of fortan-support take care of this action!