feat: method DataTypeName returns the field type as defined in the source

[Seddryck]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 65.77540% with 64 lines in your changes missing coverage. Please review.

Project coverage is 82.88%. Comparing base (57a5583) to head (e0898ff).

Files with missing lines	Patch %	Lines
PocketCsvReader/CsvRawRecord.cs	69.04%	12 Missing and 14 partials ⚠️
PocketCsvReader/CsvDataRecord.cs	68.05%	15 Missing and 8 partials ⚠️
PocketCsvReader/FieldParsing/TypeIndexer.cs	34.78%	12 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
+ Coverage   82.65%   82.88%   +0.23%     
==========================================
  Files          58       61       +3     
  Lines        1493     1502       +9     
  Branches      275      273       -2     
==========================================
+ Hits         1234     1245      +11     
+ Misses        176      170       -6     
- Partials       83       87       +4     

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