Renamed collector, aggregator to api server, api folder to agent (#133)

* Renamed aggregator -> apiServer.

* Format errors with container names.

* Renamed collector -> apiServer.

* Rephrased help messages.

* Moved api -> agent.

* Continue renameing api -> agent in Makefile and Dockerfiles.

agent/pkg/routes/metadata_routes.go

@@ -0,0 +1,13 @@
+package routes
+
+import (
+	"github.com/gofiber/fiber/v2"
+	"mizuserver/pkg/controllers"
+)
+
+// MetadataRoutes defines the group of metadata routes.
+func MetadataRoutes(fiberApp *fiber.App) {
+	routeGroup := fiberApp.Group("/metadata")
+
+	routeGroup.Get("/version", controllers.GetVersion)
+}