Move random number generator to math-support

What is the new feature

Move random number generator to libmath-support. (Adds in libiconmath!14 (merged))

How is it implemented

The random number generator module is more suitable to be put into libiconmath-support. Thus we are moving it from libfortran-support.

The next versions libfortran-support 2.0.0 and libiconmath 1.1.0 should be merged at the same time.

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

• Test coverage does not decrease
• Reviewed by a maintainer
• Incorporate review suggestions
• Prior to merging, please remove any boilerplate from the MR description, retaining only the Please describe your feature in a couple of words and describe important implementation details of the feature section to maintain
• Remember to edit the commit message and select the proper changelog category (feature/bugfix/other)

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