Migrate format checking routines from cwltool

[GlassOfWhiskey]

No description provided.

[codecov]

Codecov Report

Merging #141 (9efc877) into main (6fbab67) will increase coverage by 0.12%.
The diff coverage is 94.73%.

@@            Coverage Diff             @@
##             main     #141      +/-   ##
==========================================
+ Coverage   20.67%   20.79%   +0.12%     
==========================================
  Files          23       24       +1     
  Lines       20505    20539      +34     
  Branches     5713     5727      +14     
==========================================
+ Hits         4239     4271      +32     
  Misses      15434    15434              
- Partials      832      834       +2     

Impacted Files	Coverage Δ
cwl_utils/file_formats.py	94.11% <94.11%> (ø)
cwl_utils/graph_split.py	45.09% <100.00%> (ø)
cwl_utils/utils.py	21.10% <100.00%> (ø)

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