Moved the parser code to a new internal pkg

[lonnblad]

No description provided.

[codecov]

Codecov Report

Merging #329 into master will decrease coverage by 2.66%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #329      +/-   ##
==========================================
- Coverage   82.59%   79.93%   -2.67%     
==========================================
  Files          23       23              
  Lines        2218     2218              
==========================================
- Hits         1832     1773      -59     
- Misses        276      342      +66     
+ Partials      110      103       -7     

Impacted Files	Coverage Δ
internal/parser/parser.go	9.41% <33.33%> (ø)
run.go	81.88% <100.00%> (ø)

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