MNT: Move existing example to test suite + remove invalid one

[klauer]

• The types.EXP example may have been valid grammar back in the iec2xml days, but it does not appear to be valid for TwinCAT in 2022.
• sample.EXP is simple enough and blark parses it well; added it to the test suite where it will be packaged/installed with blark

Partially addresses #21

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@6044a3b). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #41   +/-   ##
=========================================
  Coverage          ?   67.20%           
=========================================
  Files             ?       16           
  Lines             ?     3687           
  Branches          ?        0           
=========================================
  Hits              ?     2478           
  Misses            ?     1209           
  Partials          ?        0           

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[klauer]

Hmm, looks like coverage support may still need some work. Reports are a good start, but the diff/comparison would be better.

Edit: oh, looks like I was just behind locally when making this branch. Will see what happens the next PR.