Chore: refactor grafana-apiserver a bit (#74177)

pkg/modules/dependencies.go

@@ -0,0 +1,15 @@
+package modules
+
+const (
+	// All includes all modules necessary for Grafana to run as a standalone server
+	All string = "all"
+
+	Core             string = "core"
+	GrafanaAPIServer string = "grafana-apiserver"
+)
+
+var dependencyMap = map[string][]string{
+	GrafanaAPIServer: {},
+	Core:             {},
+	All:              {Core},
+}