Add quantum espresso phonon and epw parser
@lucamghi @mscheidg Our collaborator (Pavel) is asking to include the parsers for Quantum Espresso Phonon and EPW modules. Seeking for your approval.
In addition, I am not sure how to organize this since these are modules under QE. The current QuantumEspresso parser is technically only for the SCF module. Since these modules have different output files, I decided to make them as separate parsers. QE (SCF) under parsers/electronic_structure QE-Phonon and QE-EPW under parsers/workflow What are your thoughts?