Improve example for builder RPC client

[aloknerurkar]

No description provided.

[ckartik]

@iowar worked on the original example, so will want to get his input as well.

[iowar]

This example was tested locally using the builder API instead of the noopProcessor, and a successful bid transaction took place.
but I think grpc.WithInsecure is deprecated

[aloknerurkar]

This example was tested locally using the builder API instead of the noopProcessor, and a successful bid transaction took place. but I think grpc.WithInsecure is deprecated

During actual deployment I think its easier to manage the TLS through nginx. So the client has to do some additional work. But for the purpose of the example the insecure option should be okay I think.