refactor command service to use one method per file (#416)

Updated the command service to have the same structure as all the other services within platform/...

platform/command/server.go

@@ -0,0 +1,34 @@
+package command
+
+import (
+	"github.com/go-kit/kit/endpoint"
+	"github.com/go-kit/kit/log"
+	httptransport "github.com/go-kit/kit/transport/http"
+	"github.com/gorilla/mux"
+	"github.com/micromdm/micromdm/pkg/httputil"
+)
+
+type Endpoints struct {
+	NewCommandEndpoint endpoint.Endpoint
+}
+
+func MakeServerEndpoints(s Service) Endpoints {
+	return Endpoints{
+		NewCommandEndpoint: MakeNewCommandEndpoint(s),
+	}
+}
+
+func MakeHTTPHandler(e Endpoints, logger log.Logger) *mux.Router {
+	r, options := httputil.NewRouter(logger)
+
+	// POST     /v1/commands		Add new MDM Command to device queue.
+
+	r.Methods("POST").Path("/v1/commands").Handler(httptransport.NewServer(
+		e.NewCommandEndpoint,
+		decodeNewCommandRequest,
+		httputil.EncodeJSONResponse,
+		options...,
+	))
+
+	return r
+}