Cannot instantiate union types without specifying the type literal

[jettdc]

string_type = StringType()

is invalid, you need to do

string_type = StringType(type="string")

which is redundant

Proposed solution: Add a default val for literals

something like

class StringType(pydantic.BaseModel):
    type: Literal["string"] = Field(default="string")
    ...

[jettdc]

This also applies to things like

FullRowChangeDataCaptureConfiguration(type="fullRow", ...)

which should not be necessary, as there is only one valid value there and the class itself should be enough context