fix: omit endpoint polymorphs from resolved config types

[kuhe]

EndpointResolvedConfig is now universal for all clients. In it, endpoint?: Provider<Endpoint> is declared.

Because the input type of endpoint is ?: string | Provider<string> | Endpoint | Provider<Endpoint> | EndpointV2 | Provider<EndpointV2> the resolved type combining the EndpointResolvedConfig and ClientResolvedEndpointParameters is then

(string | Provider<string> | Endpoint | Provider<Endpoint> | EndpointV2 | Provider<EndpointV2>) & Provider<Endpoint>

This is confusingly verbose, and functionally equivalent to simply Provider<Endpoint> due to intersection. Omitting the field from the resolved config will allow the type to simply be Provider<Endpoint>.