Made some changes to service wire up and options
- Inline services into AddSignalR. This aligns with the pattern
most frameworks are using now and puts it all into one place.
- Remove IHubPipeline completely and replace it with an option on
HubOptions. HubOptions now exposes a stack of IHubPipelineModules.
- Added SignalROptionsSetup which has the default configuration for
SignalR.
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