Add random number generator from libfortran-support

What is the new feature

Move the random number generators from libfortran-support

How is it implemented

Move the codes directly from libfortran-support. This is related to libfortran-support!92 (merged)

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

• Reviewed by a maintainer
• Incorporate review suggestions
• Remember to edit the commit message and select the proper changelog category (feature/bugfix/other)
• 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

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