Add `Fortran` dynamic application build

[StefanJum]

Add the Fortran applications as a dynamic build.
Test it using app-elfloader.
If any problems appear, open issues on the Unikraft core repository.

The typical process of adding apps to the dynamic-apps repository is:

• Create the app directory that will store: the executable, depending shared libraries, configuration files, data files, etc.
• Use apt download to download the package(s) (.deb)
• Extract the executable, configuration and data files required to run the application.
• Update the configuration file, if required.
• Run the executable locally, to test it.
• Run the extract.sh script to collect the necessary shared libraries:
• Now profit. Use app-elfloader.

Hackathon points: 20

[b1shtream]

@StefanJum Faced an error while solving this issue, refer #72