feat: improve handling of custom types

[Seddryck]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.82927% with 68 lines in your changes missing coverage. Please review.

Project coverage is 80.46%. Comparing base (f38bb45) to head (7dd93f3).

Files with missing lines	Patch %	Lines
...CsvReader/Configuration/SchemaDescriptorBuilder.cs	37.50%	25 Missing and 10 partials ⚠️
PocketCsvReader/CsvDataRecord.cs	67.44%	4 Missing and 10 partials ⚠️
PocketCsvReader/FormatDescriptorBuilder.cs	82.60%	4 Missing and 4 partials ⚠️
...er/Configuration/IntegerFieldDescriptionBuilder.cs	33.33%	4 Missing ⚠️
PocketCsvReader/CsvRawRecord.cs	0.00%	3 Missing ⚠️
...ader/Configuration/CustomFieldDescriptorBuilder.cs	66.66%	2 Missing ⚠️
...r/Configuration/TemporalFieldDescriptionBuilder.cs	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #100      +/-   ##
==========================================
- Coverage   82.34%   80.46%   -1.88%     
==========================================
  Files          60       65       +5     
  Lines        1484     1623     +139     
  Branches      278      307      +29     
==========================================
+ Hits         1222     1306      +84     
- Misses        172      209      +37     
- Partials       90      108      +18     

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