[utils] Add PDF subtype to pdfinfo

If the document is compliant with PDF A, E, VT, UA or X standard
print PDF subtype version, title, subtitle and explain the part
and conformance levels.
2 jobs for pdf_subtype_support in 5 minutes and 47 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #21788
build

00:05:47

passed #21789
build_clang_libcpp

00:05:45