Remove helper functions and introduce a single quality check function

[bvreede]

• the inspect_corpus is essentially the same as inspect_language
• There is one unique property, which is now captured in check_quality
• Inspect_corpus can therefore be removed
• It is likely the check_quality function should be removed eventually, as it is an odd quality measure, and the quality checks must be much broader

[codecov]

Codecov Report

Merging #32 (5f137cd) into main (a5ed18f) will increase coverage by 16.96%.
The diff coverage is 82.35%.

❗ Current head 5f137cd differs from pull request most recent head dcb8004. Consider uploading reports for the commit dcb8004 to get more accurate results

@@             Coverage Diff             @@
##             main      #32       +/-   ##
===========================================
+ Coverage   39.04%   56.01%   +16.96%     
===========================================
  Files           9        9               
  Lines         420      316      -104     
===========================================
+ Hits          164      177       +13     
+ Misses        256      139      -117     

Files	Coverage Δ
R/summaries.R	100.00% <100.00%> (ø)
R/source_quality.R	78.57% <78.57%> (ø)

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