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)
```

まず、issue に示されている GraphQL スキーマで失敗を再現し、未解決の FooOrderByInput 型の周辺にある schema builder の経路を調べてください。ソースファイルやテストファイルは指定されていません。オブジェクト型が GraphQL enum を使用したときにスキーマが正常に構築され、この例に対するカバレッジがある状態を完了とします。

索引モデルが issue の本文から書いたものです。