Validation errors enhanced

[dapper91]

Validation errors enhanced:

• validation errors provide the full path to the malformed field (including nested sub-models).
• error text contain the xml document source line where the error occurred (lxml parser only).

Example:

from typing import Literal, Optional, Tuple

from pydantic_xml import BaseXmlModel, attr, element


class Product(BaseXmlModel):
    status: Literal['running', 'development'] = attr()
    launched: Optional[int] = attr(default=None)
    title: str


class Company(BaseXmlModel, tag='Company'):
    products: Tuple[Product, ...] = element(tag='product')


xml = '''
<Company>
    <product status="runing" launched="2013">Several launch vehicles</product>
    <product status="running" launched="a2019">Starlink</product>
    <product status="development">Starship</product>
</Company>
'''

Company.from_xml(xml)

text before:

pydantic_core._pydantic_core.ValidationError: 1 validation error for Product
status
  Input should be 'running' or 'development' [type=literal_error, input_value='runing', input_type=str]
    For further information visit https://errors.pydantic.dev/2.5/v/literal_error

text after:

pydantic_core._pydantic_core.ValidationError: 2 validation errors for Company
products.0.status
  [line 3]: Input should be 'running' or 'development' [type=literal_error, input_value='runing', input_type=str]
products.1.launched
  [line 4]: Input should be a valid integer, unable to parse string as an integer [type=int_parsing, input_value='a2019', input_type=str]

Fixes the issue #81.

[codecov-commenter]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (f38d18f) 91.98% compared to head (d785fb2) 91.71%.

Files	Patch %	Lines
pydantic_xml/serializers/factories/model.py	86.48%	5 Missing ⚠️
pydantic_xml/element/native/lxml.py	0.00%	3 Missing ⚠️
pydantic_xml/element/element.py	91.30%	2 Missing ⚠️
pydantic_xml/serializers/factories/primitive.py	83.33%	1 Missing ⚠️
pydantic_xml/serializers/factories/raw.py	80.00%	1 Missing ⚠️
pydantic_xml/serializers/factories/wrapper.py	88.88%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #150      +/-   ##
==========================================
- Coverage   91.98%   91.71%   -0.28%     
==========================================
  Files          26       26              
  Lines        1410     1508      +98     
==========================================
+ Hits         1297     1383      +86     
- Misses        113      125      +12     

Flag	Coverage Δ
unittests	91.71% <91.55%> (-0.28%)	⬇️

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