perf: switch to memory and prevent copy of buffer

[Seddryck]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.88525% with 8 lines in your changes missing coverage. Please review.

Project coverage is 72.14%. Comparing base (db5f2ea) to head (89bc8fd).

Files with missing lines	Patch %	Lines
PocketCsvReader/CsvDataReader.cs	80.00%	2 Missing and 3 partials ⚠️
PocketCsvReader/RecordParser.cs	87.50%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
- Coverage   74.67%   72.14%   -2.53%     
==========================================
  Files          12       12              
  Lines         608      560      -48     
  Branches      127      122       -5     
==========================================
- Hits          454      404      -50     
- Misses        119      121       +2     
  Partials       35       35              

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