Create script to check for integer constants that are meant to be reals

### Issue Type

Other (please describe below)

### Issue Description

Numbers like `2_r8` are interpreted as `integer(r8)`, rather than `real(r8)`. Since Fortitude does not flag these, we need a way to identify numbers that are intended to be reals but are being interpreted as integers (which could lead to accidentally doing integer arithmetic)

The new script should:
1. Identify potentially erroneous numbers in committed code
2. Run as part of the Fortran linting CI.

### Will this change answers?

No

### Will you be implementing this yourself?

Any Software Engineer can do this

Start by locating the existing Fortitude configuration and Fortran linting CI workflow, then inspect how checks are currently defined and run. Define the cases the script should identify in committed code and integrate it into that linting run; done means the script detects the problematic integer constants and CI executes it.

Written by the indexing model from the issue text.