Feature/kbdev 1180 new mutalyzer loader

[sshugsc]

Make a loader to handle variant notation "translation" from Mutalyzer.

Focus on the Normalizer for now.

[mathieulemieux]

@sshu, this is a good first step!

As discussed earlier (maybe we should add this to the ticket description), we may or may not want a full-fledged loader here; maybe utility functions or even someting behing the graphKB API. Let's have a quick chat together about the next steps.

Also, we should add some logic to parse and filter what is returned by fetchAndLoadByDescription(). I'll add this comment and others on the ticket, so we have a everything at the same place.

[mathieulemieux]

I closed this PR for now, but will revisit when a decision will be taken on how/where the functionality should be added.