[PSyData] Kernel Extraction: implement stand-alone version of wrapper library that does not depend on NetCDF

[hiker]

For compilation tests (and when migrating to really new platforms) it is useful to have an extraction and reading library that does not depend on NetCDF.

• [x] Implement basic writing using Fortran binary files
• [x] Implement LFRic version (that might likely just be the same as the NetCDF files)
• [x] Implement GOcean version (that might likely just be the same as the NetCDF files)
• [x] Implement Reader library
• [ ] Updated READMEs
• [ ] Update user guide/dev
• [ ] Add compilation tests(?)
• [ ] Add tests to make sure writer and driver write variables in the same order.