Implement GraphQL Introspection Field and Type System

[mentatbot]

This PR implements the IntrospectionField struct and makes several improvements to the GraphQL introspection type system:

1. Implemented IntrospectionField with all required properties
2. Created TypeRef for consistent type references
3. Updated all collection fields to use slices where appropriate
4. Implemented IntrospectionEnumValue
5. Fixed InputFields in IntrospectionInputObjectType

These changes create a more accurate representation of the GraphQL type system for introspection.

Closes #1

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[mentatbot]

Hi @chris-ramon,

I've implemented the IntrospectionField struct and made several improvements to the GraphQL introspection type system. Here's what I did:

1. Implemented IntrospectionField with all required properties according to the GraphQL specification (name, description, args, type, deprecation info).

2. Fixed inconsistencies in the type definitions:

   • Updated fields that should contain collections to use slices instead of single values
   • Created a specific TypeRef type to replace generic interface{} references
   • Implemented the missing IntrospectionEnumValue type
   • Fixed the InputFields property in IntrospectionInputObjectType
   • Ensured consistent type references across the codebase

These changes create a more accurate and complete representation of the GraphQL type system for introspection queries, which is essential for compatibility testing.

Let me know if you have any questions or would like any adjustments to this implementation!