Merge pull request #112 from dapper91/dev

- model level skip_empty parameter added.
- wrapped element extra entities checking bugs fixed.

Merge pull request #107 from dapper91/dev

- pydantic extra='forbid' parameter is being applied to xml elements too.

Merge pull request #104 from dapper91/dev

- raw element typed fields support added. See #14.
- pydantic field exclude flag bug fixed (works only for serialization now).

Merge pull request #97 from dapper91/dev

- library upgraded to pydantic version 2. See https://docs.pydantic.dev/2.0/migration/
- generic models are no longer inherited from BaseGenericXmlModel but from BaseXmlModel.
- custom root type declaration has been changed. It must inherit RootXmlModel from now on.
- encoding customization api has been changed. See https://pydantic-xml.readthedocs.io/en/v2.0.0/pages/misc.html#encoding
- element attributes can be bound to TypedDict. See https://pydantic-xml.readthedocs.io/en/v2.0.0/pages/data-binding/mappings.html#typed-dict
- tagged unions support added. See https://pydantic-xml.readthedocs.io/en/v2.0.0/pages/data-binding/unions.html#discriminated-unions
- computed entities support added. See https://pydantic-xml.readthedocs.io/en/v2.0.0/pages/misc.html#computed-entities

bump version 2.0.0b3.

bump version 2.0.0b2.

bump version 2.0.0b1.

bump version 2.0.0a2.

bump version 2.0.0a1.

Merge pull request #76 from dapper91/dev

- library api stabilized
- custom root type serialization format changed.