Add query functions on TypeDefinition

[jfecher]

Problem

To work with TypeDefinition objects the user needs to be provided some query functions to be able to inspect the type.

Happy Case

We should add at least:

• fn generics(self) -> [Token]
• fn as_type(self) -> Type
• fn fields(self) -> [(Token, Type)]

Project Impact

None

Impact Context

No response

Workaround

None

Workaround Description

No response

Additional Context

No response

Would you like to submit a PR for this Issue?

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Support Needs

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