add restlike connection impl

restlike/connect/receiver.go

restlike/connect/request.go

restlike/connect/response.go

restlike/connect/server.go

restlike/single/receiver.go

restlike/single/receiver_test.go

restlike/single/request.go

restlike/single/response.go

restlike/single/response_test.go

restlike/single/server.go

restlike/types.go