FEMT: Basic frontend-service implementation (#104229)

* create the most basic frontend-server module

* expose prom metrics??

* add todo list

* move frontend-service to its own folder in services

* check error from writer.Write

* reword comment, add launch config

pkg/modules/dependencies.go

@@ -9,6 +9,7 @@ const (
 	StorageServer         string = "storage-server"
 	ZanzanaServer         string = "zanzana-server"
 	InstrumentationServer string = "instrumentation-server"
+	FrontendServer        string = "frontend-server"
 )
 
 var dependencyMap = map[string][]string{
@@ -17,4 +18,5 @@ var dependencyMap = map[string][]string{
 	ZanzanaServer:    {InstrumentationServer},
 	Core:             {},
 	All:              {Core},
+	FrontendServer:   {},
 }