Use of enum type causes schema builder to fail

If an Object Type is using a GraphQL enum, the schema will fail to build.

Here's an example schema:

```graphql
enum Foo {
Bar
}

type Model @model {
id: String!
foo: Foo!
}
```

Here's the error in the console:

```
fail: Microsoft.AspNetCore.Server.Kestrel[13]
Connection id "0HMK73NKBA43B", Request id "0HMK73NKBA43B:00000027": An unhandled exception was thrown by the application.
HotChocolate.SchemaException: For more details look at the `Errors` property.

1. Unable to resolve type reference `None: FooOrderByInput`. (HotChocolate.Types.InputObjectType)

at HotChocolate.Configuration.RegisteredType.GetType[T](ITypeReference typeRef)
at HotChocolate.Types.InputField.OnCompleteField(ITypeCompletionContext context, ITypeSystemMember declaringMember, InputFieldDefinition definition)
at HotChocolate.Types.FieldBase`1.CompleteField(ITypeCompletionContext context, ITypeSystemMember declaringMember)
at HotChocolate.Types.FieldBase`1.HotChocolate.Types.Helpers.IFieldCompletion.CompleteField(ITypeCompletionContext context, ITypeSystemMember declaringMember)
at HotChocolate.Internal.FieldInitHelper.CompleteFieldsInternal[TField](ITypeCompletionContext context, ITypeSystemMember declaringMember, TField[] fields)
at HotChocolate.Internal.FieldInitHelper.CompleteFieldsInternal[TFieldDefinition,TField](ITypeCompletionContext context, ITypeSystemMember declaringMember, IEnumerable`1 fieldDefinitions, Func`3 fieldFactory, Int32 fieldCount)
at HotChocolate.Internal.FieldInitHelper.CompleteFields[TFieldDefinition,TField](ITypeCompletionContext context, ITypeSystemMember declaringMember, IReadOnlyList`1 fieldDefs, Func`3 fieldFactory)
at HotChocolate.Types.InputObjectType.OnCompleteFields(ITypeCompletionContext context, InputObjectTypeDefinition definition)
at HotChocolate.Types.InputObjectType.OnCompleteType(ITypeCompletionContext context, InputObjectTypeDefinition definition)
at HotChocolate.Types.TypeSystemObjectBase`1.CompleteType(ITypeCompletionContext context)
at HotChocolate.Configuration.TypeInitializer.g__CompleteType|27_0(RegisteredType registeredType)
at HotChocolate.Configuration.TypeInitializer.ProcessTypes(TypeDependencyKind kind, Func`2 action)
at HotChocolate.Configuration.TypeInitializer.CompleteTypes()
at HotChocolate.Configuration.TypeInitializer.Initialize()
at HotChocolate.SchemaBuilder.Setup.InitializeTypes(SchemaBuilder builder, IDescriptorContext context, IReadOnlyList`1 types, LazySchema lazySchema)
at HotChocolate.SchemaBuilder.Setup.Create(SchemaBuilder builder, LazySchema lazySchema, IDescriptorContext context)
at HotChocolate.SchemaBuilder.Create(IDescriptorContext context)
at HotChocolate.SchemaBuilder.HotChocolate.ISchemaBuilder.Create(IDescriptorContext context)
at HotChocolate.Execution.RequestExecutorResolver.CreateSchemaAsync(NameString schemaName, RequestExecutorSetup options, RequestExecutorOptions executorOptions, IServiceProvider serviceProvider, TypeModuleChangeMonitor typeModuleChangeMonitor, CancellationToken cancellationToken)
at HotChocolate.Execution.RequestExecutorResolver.CreateSchemaServicesAsync(NameString schemaName, RequestExecutorSetup options, CancellationToken cancellationToken)
at HotChocolate.Execution.RequestExecutorResolver.GetRequestExecutorNoLockAsync(NameString schemaName, CancellationToken cancellationToken)
at HotChocolate.Execution.RequestExecutorResolver.GetRequestExecutorAsync(NameString schemaName, CancellationToken cancellationToken)
at HotChocolate.Execution.RequestExecutorProxy.GetRequestExecutorAsync(CancellationToken cancellationToken)
at HotChocolate.AspNetCore.HttpPostMiddlewareBase.HandleRequestAsync(HttpContext context, AllowedContentType contentType)
at HotChocolate.AspNetCore.HttpPostMiddlewareBase.InvokeAsync(HttpContext context)
at Microsoft.AspNetCore.Builder.EndpointRouteBuilderExtensions.<>c__DisplayClass13_0.<b__1>d.MoveNext()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Routing.EndpointMiddleware.g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
at Azure.DataApiBuilder.Service.AuthenticationHelpers.AuthenticationMiddleware.InvokeAsync(HttpContext httpContext) in /home/vsts/work/1/s/src/Service/AuthenticationHelpers/AuthenticationMiddleware.cs:line 87
at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
at Azure.DataApiBuilder.Service.Startup.<>c__DisplayClass8_0.<b__2>d.MoveNext() in /home/vsts/work/1/s/src/Service/Startup.cs:line 280
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)
```

Bắt đầu bằng cách tái hiện lỗi với schema GraphQL được hiển thị trong issue và kiểm tra đường dẫn schema builder xung quanh kiểu FooOrderByInput chưa được phân giải. Không có tệp mã nguồn hay tệp kiểm thử nào được nêu; công việc được xem là hoàn tất khi schema được xây dựng thành công khi một kiểu object sử dụng enum GraphQL, với coverage cho ví dụ này.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.