Missing Pydantic dependency in latest release

[oseovie]

When using the latest release of PaystackEase (v2.3.5), the library does not automatically install Pydantic.
Some functions (like transaction initialization and bulk charge) internally use Pydantic models,
causing ModuleNotFoundError: No module named 'pydantic' if Pydantic is not installed separately.

[cla-bit]

Ok...that should with the missing dependency in the pyproject.toml file.