Custom field xml serializer/validator support added.

[dapper91]

Adds support for custom field xml serialization and validation.

Example:

model.py:

import pathlib
from typing import List
from xml.etree.ElementTree import canonicalize

from pydantic_xml import BaseXmlModel, element, xml_field_serializer, xml_field_validator
from pydantic_xml.element import XmlElementReader, XmlElementWriter


class Plot(BaseXmlModel):
    x: List[float] = element()
    y: List[float] = element()

    @xml_field_validator('x', 'y')
    def validate_space_separated_list(cls, element: XmlElementReader, field_name: str) -> List[float]:
        if element := element.pop_element(field_name, search_mode=cls.__xml_search_mode__):
            return list(map(float, element.pop_text().split()))

        return []

    @xml_field_serializer('x', 'y')
    def serialize_space_separated_list(self, element: XmlElementWriter, value: List[float], field_name: str) -> None:
        sub_element = element.make_element(tag=field_name, nsmap=None)
        sub_element.set_text(' '.join(map(str, value)))

        element.append_element(sub_element)


xml_doc = pathlib.Path('./doc.xml').read_text()
plot = Plot.from_xml(xml_doc)

assert canonicalize(plot.to_xml(), strip_text=True) == canonicalize(xml_doc, strip_text=True)

doc.xml:

<Plot>
    <x>0.0 1.0 2.0 3.0 4.0 5.0</x>
    <y>0.0 3.2 5.4 4.1 2.0 -1.2</y>
</Plot>

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.05%. Comparing base (b918ae7) to head (3de17e2).
Report is 3 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #212      +/-   ##
==========================================
+ Coverage   91.89%   92.05%   +0.15%     
==========================================
  Files          29       29              
  Lines        1617     1648      +31     
==========================================
+ Hits         1486     1517      +31     
  Misses        131      131              

Flag	Coverage Δ
unittests	92.05% <100.00%> (+0.15%)	⬆️

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