Fix #984

[BezrukovM]

add underlying color space for PDPattern

[codecov]

Codecov Report

Merging #373 into integration will decrease coverage by 0.01%.
The diff coverage is 0%.

@@                Coverage Diff                @@
##             integration     #373      +/-   ##
=================================================
- Coverage          25.17%   25.15%   -0.02%     
  Complexity           867      867              
=================================================
  Files                233      233              
  Lines              12820    12828       +8     
  Branches            1820     1820              
=================================================
  Hits                3227     3227              
- Misses              9218     9226       +8     
  Partials             375      375

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/org/verapdf/pd/patterns/PDPattern.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../org/verapdf/factory/colors/ColorSpaceFactory.java	0% <0%> (ø)	0 <0> (ø)	⬇️

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