♻️ REFACTOR: move basic parsing into `BaseParser` class

[bastonero]

Adapt parser for aiidateam/aiida-quantumespresso#756 .

[mbercx]

@bastonero if you haven't already started, I can take care of this one.

[bastonero]

@mbercx I did not, I am currently focusing on other HP-related issues. Glad if you can work on this! Thanks!