Use IHttpClientFactory instead of manually creating a HttpClient

[NecatiMeral]

This enables customization of the created client or it's handlers from outside of this module.

IHttpClientFactory provides different endpoints to customize the created clients. One of them would be to implement a custom IHttpMessageHandlerBuilderFilter and register it in the ioc framework.

My use case is a validation of self-signed certificates that aren't known to the clients or injecting a WinHttpHandler into the httpclient automatically to be used by .net-fx projects which use the Volo.Abp.IdentityModel package.

[maliming]

hi @NecatiMeral

Since there is no AddHttpClient method to register IHttpClientFactory. It will cause dependency injection problems.

And should we use named Clients?

Because the abp 2.2 version will be released soon, I temporarily reverted this. #2953