[Partial] Init tracing and client server

[at15]

Still, first build concrete example using icehub, then abstract stuff into the ice package

• [ ] example
  • [ ] login
  • [x] github oauth
• [ ] service interface?
• [ ] http
  • [x] server
  • [ ] client
• [ ] grpc
  • [ ] server
  • [ ] client
• [ ] tracing
  • [ ] database
  • [ ] calling third party API