Support for Pydantic discriminator

[bernardoVale]

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Describe the solution you'd like The ability to use pydantic discriminator when defining the field schema.

https://pydantic-docs.helpmanual.io/usage/types/#discriminated-unions-aka-tagged-unions

Describe alternatives you've considered The alternative is always to ensure that all subtypes have a unique and required field so that pydantic generates the correct type instead of using a common field and using the value as the discriminator.

Additional context

https://pydantic-docs.helpmanual.io/usage/types/#discriminated-unions-aka-tagged-unions

[bernardoVale]

I hacked the code a little bit and managed to make it work the way I want by adding discriminator to this list: https://github.com/koxudaxi/datamodel-code-generator/blob/master/datamodel_code_generator/parser/jsonschema.py#L274 is that an acceptable implementation?