Release March 2024 - Support for preCICE v3 + more

[MakisH]

Main changes:

• The module now assumes preCICE v3. (Port to preCICE v3 API #14)
• Add the Fortran files have been renamed from .f03 to .f90, which is generally assumed to be a good practice. (Change file extension of Fortran source files to .f90 #17)
• To build the module, as well as the example, a compiler that supports Fortran 2003 is now explicitly required (previously, that was implied). (Require std=f2003 and update some legacy style #20)

Various under-the hood fixes:

• A Git pre-commit hook now checks the shell scripts, the markdown files, and the preCICE configuration file for common syntax and formatting issues. (Add a pre-commit hook #24)
• A GitHub Actions workflow tests every commit and pull request. (Add a GitHub Actions workflow to build and run #27)
• The example now includes a cleaning script and a .gitignore file. (Solverdummy clean.sh and .gitignore #21)

@IshaanDesai could you please do a sanity check in the diff and see if you spot any show-stoppers?

The only PR that could be interesting integrating already is #26 (dropping all the size arguments from next to the strings). However, it is not necessary to wait for it, as that would only be an enhancement.

I would then tag this as v3.0.0.0, similar to other bindings.