[CX-1182] protowhat refactor

[hermansje]

Ticket

Link to ticket: https://datacamp.atlassian.net/browse/CX-1182

What has been done

• Update sheetwhat to build on this protowhat refactor.

How to test

• Run the tests on top of the protowhat branch

[codecov]

Codecov Report

Merging #33 into master will decrease coverage by 0.36%.
The diff coverage is 89.47%.

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
- Coverage   99.04%   98.67%   -0.37%     
==========================================
  Files          15       16       +1     
  Lines         521      528       +7     
==========================================
+ Hits          516      521       +5     
- Misses          5        7       +2

Impacted Files	Coverage Δ
sheetwhat/sct_syntax.py	0% <0%> (-100%)	⬇️
sheetwhat/checks/__init__.py	100% <100%> (ø)	⬆️
sheetwhat/sct_context.py	100% <100%> (ø)
sheetwhat/State.py	100% <100%> (ø)	⬆️
sheetwhat/checks/check_chart.py	100% <100%> (ø)	⬆️
sheetwhat/Test.py	98.61% <66.66%> (+1.38%)	⬆️
sheetwhat/test_exercise.py	96% <94.11%> (-4%)	⬇️

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