refactor(extract): reorganizes so it's easier to expand functionality

[sverweij]

Description, Motivation and Context

• puts the various ast perusers in their own folders
• moves the 'parse' wrappers to their respective folders
• redistributes responsibilities between extract-depencencies module and parser specific code
• names things slightly more standardly, so it's easier to grok what happens (i.e. use parse when parsing things over various other terminology)

Unifying the 'per-parser' interfaces makes it more easy to add a new one/ or make it a plugin mechanism if necessary. Also, by setting up the interface we can introduce a mechanism to do other things with AST's, like providing information on the barelly-ness, LoC, NoS.

How Has This Been Tested?

• [x] green ci

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] Documentation only change
• [x] Refactor (non-breaking change which fixes an issue without changing functionality)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [x] :book:

  • My change doesn't require a documentation update, or ...
  • it does and I have updated it

• [x] :balance_scale:

  • The contribution will be subject to The MIT license, and I'm OK with that.
  • The contribution is my own original work.
  • I am ok with the stuff in CONTRIBUTING.md.

[codeclimate[bot]]

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