Add Optional wrapping, type/field annotations, and type overrides for GraphQL APT

[velo]

Summary

• Nullable GraphQL fields wrapped in Optional<> by default (useOptional = true on @GraphqlSchema, overridable per method via Toggle)
• typeAnnotations/rawTypeAnnotations on @GraphqlSchema and @GraphqlQuery to add annotations to all generated records (e.g. @Builder, @Jacksonized)
• Collision rule: when same annotation in both typeAnnotations and rawTypeAnnotations, the class provides only the import
• uses on @GraphqlSchema for import-only classes (needed by raw annotations)
• @GraphqlField (repeatable, class + method level) for field-level annotations, type overrides, and dot notation for nested fields
• nonNullTypeAnnotations/nonNullRawTypeAnnotations to auto-annotate all non-null (!) fields (e.g. @NotNull)
• Shared unwrapTypeName/findFieldDefinition in GraphqlTypeMapper, deduplicated annotation resolution logic

Test plan

• 55 tests covering all new features: Optional wrapping, type annotations, raw annotations, collision behavior, field annotations, dot notation, type overrides, non-null annotations, uses imports, class/method level inheritance
• All existing tests updated to reflect useOptional = true default
• mvn test passes for graphql and graphql-apt modules

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