Named tuple support

[dapper91]

Named tuple support added.

Implements the feature request .

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 89.47368% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 91.86%. Comparing base (0e2c209) to head (61ff07f).

Files	Patch %	Lines
pydantic_xml/serializers/factories/named_tuple.py	87.80%	5 Missing ⚠️
pydantic_xml/serializers/factories/call.py	90.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #192      +/-   ##
==========================================
- Coverage   91.96%   91.86%   -0.10%     
==========================================
  Files          27       29       +2     
  Lines        1555     1610      +55     
==========================================
+ Hits         1430     1479      +49     
- Misses        125      131       +6     

Flag	Coverage Δ
unittests	91.86% <89.47%> (-0.10%)	⬇️

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