Expose entire EndpointBuilder to filter factories #43255
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This flows the entire
EndpointBuilder
through to endpoint filter factories. This gives more context like the display name to filters, and reduces the number of properties inRequestDelegateFactoryOptions
andEndpointFilterFactoryContext
. And since theEndpointBuilder
is usually aRouteEndpointBuilder
, filters can observe the route pattern as well.EndpointBuilder.RequestDelegate
must benull
if it is passed into theRequestDelegateFactory.Create()
. TheRequestDelegateFactory
sets theRequestDelegate
to the same instance returned viaRequestDelegateResult.RequestDelegate
. This is similar to how we were already mutating the passed-in metadata that was also then returned.Fixes #43000