feat: annotated form of field serializer/validator support added.

[dapper91]

Adds support for annotated form for field serializer/validator.

Example:

import pathlib
from typing import Annotated, List, Type

import pydantic_xml as pxml
from pydantic_xml.element import XmlElementReader, XmlElementWriter


def validate_space_separated_list(
        cls: Type[pxml.BaseXmlModel],
        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 []


def serialize_space_separated_list(
        model: pxml.BaseXmlModel,
        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)


SpaceSeparatedValueList = Annotated[
    List[float],
    pxml.XmlFieldValidator(validate_space_separated_list),
    pxml.XmlFieldSerializer(serialize_space_separated_list),
]


class Plot(pxml.BaseXmlModel):
    x: SpaceSeparatedValueList = pxml.element()
    y: SpaceSeparatedValueList = pxml.element()

Closes the issue

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.15%. Comparing base (d528114) to head (5b5365e).

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #261      +/-   ##
==========================================
+ Coverage   92.08%   92.15%   +0.07%     
==========================================
  Files          29       29              
  Lines        1680     1695      +15     
==========================================
+ Hits         1547     1562      +15     
  Misses        133      133              

Flag	Coverage Δ
unittests	92.15% <100.00%> (+0.07%)	⬆️

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