Teleport install command for discovery agents (go) (#43423)

* Teleport install command for discovery agents (go)

This PR adds a new command that will install teleport on the current
system.
Its goal is to replace the default installer script used in Auto
Discovery scripts.

Its correctness should be compared to the current script. Improvements
will only be considered on a 2nd phase.

* rename ani/asi and re-organize install/configure sections

* create lib/utils/packagemanager package

* rename Autodiscover to AutoDiscover

api/types/constants.go

@@ -672,6 +672,14 @@ const (
 	// id found via automatic discovery, to avoid re-running
 	// installation commands on the node.
 	ProjectIDLabel = TeleportInternalLabelPrefix + "project-id"
+	// RegionLabel is used to identify virtual machines by region found
+	// via automatic discovery, to avoid re-running installation commands
+	// on the node.
+	RegionLabel = TeleportInternalLabelPrefix + "region"
+	// ResourceGroupLabel is used to identify virtual machines by resource-group found
+	// via automatic discovery, to avoid re-running installation commands
+	// on the node.
+	ResourceGroupLabel = TeleportInternalLabelPrefix + "resource-group"
 	// ZoneLabel is used to identify virtual machines by GCP zone
 	// found via automatic discovery, to avoid re-running installation
 	// commands on the node.