TUN-8728: implement diag/tunnel endpoint

## Summary
The new endpoint returns the current information to be used when calling the diagnostic procedure.
This also adds:
- add indexed connection info and method to extract active connections from connTracker
- add edge address to Event struct and conn tracker
- remove unnecessary event send
- add tunnel configuration handler
- adjust cmd and metrics to create diagnostic server

Closes TUN-8728

metrics/readiness.go

@@ -7,7 +7,6 @@ import (
 
 	"github.com/google/uuid"
 
-	conn "github.com/cloudflare/cloudflared/connection"
 	"github.com/cloudflare/cloudflared/tunnelstate"
 )
 
@@ -28,10 +27,6 @@ func NewReadyServer(
 	}
 }
 
-func (rs *ReadyServer) OnTunnelEvent(c conn.Event) {
-	rs.tracker.OnTunnelEvent(c)
-}
-
 type body struct {
 	Status           int       `json:"status"`
 	ReadyConnections uint      `json:"readyConnections"`