Cleanup usages of PDFName and group common names in PDFNames

[NicolaVerbeeck]

Prepare release 0.4.1

[codecov]

Codecov Report

Merging #42 (e8b983a) into main (325abb3) will decrease coverage by 0.19%.
The diff coverage is 44.44%.

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
- Coverage   75.37%   75.18%   -0.19%     
==========================================
  Files          27       28       +1     
  Lines        1210     1205       -5     
==========================================
- Hits          912      906       -6     
- Misses        298      299       +1     

Files Changed	Coverage Δ
lib/src/model/pdf_constants.dart	0.00% <0.00%> (ø)
lib/src/parser/indirect_object_parser.dart	5.17% <0.00%> (ø)
lib/src/parser/pdf_object_parser.dart	75.78% <0.00%> (ø)
lib/src/parser/pdf_parser.dart	25.00% <0.00%> (ø)
lib/src/parser/xref_reader.dart	46.82% <0.00%> (ø)
lib/src/utils/filter/flate_decode_filter.dart	1.63% <0.00%> (ø)
lib/src/utils/filter/stream_filter.dart	68.75% <ø> (ø)
lib/src/model/pdf_document.dart	100.00% <100.00%> (ø)
lib/src/model/pdf_document_catalog.dart	97.77% <100.00%> (-0.27%)	⬇️
lib/src/model/pdf_outline.dart	100.00% <100.00%> (ø)
... and 2 more

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