Cannot use RateLimiter with DependencyInjection

[bichuga]

See https://stackoverflow.com/questions/67577658/how-can-i-use-ratelimiters-httpclient-delegatinghandler-with-dependency-injecti

Issue:

[2021-05-17T21:58:00.116Z] Microsoft.Extensions.Http: The 'InnerHandler' property must be null. 'DelegatingHandler' instances provided to 'HttpMessageHandlerBuilder' must not be reused or cached.
[2021-05-17T21:58:00.117Z] Handler: 'ComposableAsync.DispatcherDelegatingHandler'.
[2021-05-17T21:58:00.122Z] An unhandled host error has occurred.

[jeffward01]

This can be fixed and is explained here: https://stackoverflow.com/questions/67577658/how-can-i-use-ratelimiters-httpclient-delegatinghandler-with-dependency-injecti

This line needs to be removed: https://github.com/David-Desmaisons/ComposableAsync/blob/e47a20178ff5a6e8a5bab5034dc6413720484bc2/ComposableAsync.Core/DelegatingHandler/DispatcherDelegatingHandler.cs#L21

ASP.NET Core should set that, not an external library. ASP.Net core handles that code, it expects to see null (so that it can set it via DI, but sees that it is not null (hence the error).

If we remove that line, the issue should be fixed