Support configuration options for GraphQLHttpClient

[jballe]

Use SitecoreGraphQlClientOptions for GraphQLHttpClient and support Configure

Description / Motivation

With this change it is possible to configure the GraphQLClient with Configure in DependencyInjection.

e.g. in a WebApplicationFactory call services.Configure<SitecoreGraphQlClientOptions>(cfg => cfg.HttpMessageHandler = _mockClientHandler);

The value is already consumed through dependency injection in eg. GraphQlSiteInfoService

The consequence is that any validation error are thrown upon first time the GraphQLHttpClient is resolved instead of on initial call to AddGraphQlClient during application setup.

Testing

• The Unit & Intergration tests are passing.
• I have added the necessary tests to cover my changes.

Terms

• I agree to follow this project's Code of Conduct.

[jballe]

I have added a sample implementation using this configure feature at https://github.com/jballe/Sitecore-ASP.NET-SDK-IntegrationTest

[sc-ivanlieckens]

The consequence is that any validation error are thrown upon first time the GraphQLHttpClient is resolved instead of on initial call to AddGraphQlClient during application setup.

Could you explain why this is desirable? I might be misunderstanding but doesn't this mean that a misconfiguration of the application is simply detectable much later rather than sooner?