[client] Merge conntype package into peer

The conntype package held only ConnPriority and its constants and was
imported solely by peer. Move it into the peer package as priority.go
and drop the conntype. qualifier from conn.go, event.go and worker_ice.go.

client/internal/peer/event.go

@@ -5,7 +5,6 @@ import (
 
 	"github.com/pion/ice/v4"
 
-	"github.com/netbirdio/netbird/client/internal/peer/conntype"
 	"github.com/netbirdio/netbird/route"
 )
 
@@ -35,7 +34,7 @@ type evRemoteCandidate struct {
 }
 
 type evICEReady struct {
-	priority conntype.ConnPriority
+	priority ConnPriority
 	info     ICEConnInfo
 }