Fortran interface for bytes functionality

[mellis13]

Description

In #521, functionality was added to operate on raw bytes in the C++ and Python clients. This ticket is for the addition of a similar Fortran interface for these byte operations.

Justification

In an effort to provide a uniform experience across all clients, the Fortran interface for byte operations should be implemented.

Implementation Strategy

The C++ interface for the bytes operations uses only void* pointers. As a result, the c-bindings for Fortran interface should be fairly straight forward.