feat: support of grpc.ClientConnInterface allows custom streams #72
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This makes StreamDirector function to accept
grpc.ClientConnInterfaceinstead of strict*grpc.ClientConnimplementation. This allows to use custom connection implementations and stubs, like inprocess stream channeling without real network connection (https://pkg.go.dev/github.com/fullstorydev/grpchan/inprocgrpc)I added the changed version interfaces to make this changes backwards-compatible.
Maybe it is woth of releasing another version of grpc-proxy package, that is not compatible with previous one on interface level.
If we just change StreamDirector declaration, all implementations of StreamDirector will become incompatible with the new interface :(