Adding a plaso scaffolder interface and a plaso SQlite scaffolder

[kiddinn]

Adding a plaso scaffolder interface as well as the first plaso plugin, a SQlite plugin scaffolder.

[kiddinn]

This PR should not be reviewed yet, it depends on libraries from https://github.com/log2timeline/PlasoScaffolder/pull/27

Wait until that PR has been pushed before reviewing.

[kiddinn]

this should be ready for review now

[codecov[bot]]

Codecov Report

Merging #28 into master will decrease coverage by 0.82%. The diff coverage is 89.2%.

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
- Coverage   97.85%   97.03%   -0.83%     
==========================================
  Files          58       61       +3     
  Lines        1355     1552     +197     
==========================================
+ Hits         1326     1506     +180     
- Misses         29       46      +17

Impacted Files	Coverage Δ
plasoscaffolder/lib/engine.py	85% <ø> (-0.25%)	:arrow_down:
plasoscaffolder/lib/file_handler.py	91.11% <ø> (ø)	:arrow_up:
plasoscaffolder/scaffolders/__init__.py	100% <100%> (ø)
plasoscaffolder/scaffolders/manager.py	97.01% <100%> (+0.18%)	:arrow_up:
plasoscaffolder/scaffolders/plaso.py	84.95% <84.95%> (ø)
plasoscaffolder/scaffolders/interface.py	92.85% <87.5%> (-2.27%)	:arrow_down:
plasoscaffolder/scaffolders/plaso_sqlite.py	94.87% <94.87%> (ø)
... and 1 more

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[kiddinn]

Ready for another round