feat: add a descriptor for the runtime type parser

[Seddryck]

• docs: review for all fluent APIs

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 74.35897% with 20 lines in your changes missing coverage. Please review.

Project coverage is 79.62%. Comparing base (973058e) to head (3e2f36b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...r/Configuration/RuntimeParsersDescriptorBuilder.cs	61.53%	2 Missing and 3 partials ⚠️
...svReader/Configuration/RuntimeParsersDescriptor.cs	60.00%	3 Missing and 1 partial ⚠️
PocketCsvReader/CsvDataRecord.cs	90.00%	1 Missing and 2 partials ⚠️
PocketCsvReader/FieldParsing/TypeIndexer.cs	62.50%	3 Missing ⚠️
PocketCsvReader/Configuration/CsvReaderBuilder.cs	60.00%	2 Missing ⚠️
...ader/Configuration/CustomFieldDescriptorBuilder.cs	0.00%	1 Missing ⚠️
...er/Configuration/IntegerFieldDescriptionBuilder.cs	0.00%	1 Missing ⚠️
...ader/Configuration/NumberFieldDescriptorBuilder.cs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #113      +/-   ##
==========================================
- Coverage   79.95%   79.62%   -0.33%     
==========================================
  Files          66       68       +2     
  Lines        1661     1703      +42     
  Branches      319      326       +7     
==========================================
+ Hits         1328     1356      +28     
- Misses        218      227       +9     
- Partials      115      120       +5     

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