Cerate specific error code for DNS failed resolution

[mikegorman-nf]

An error in DNS resolution on the hosting device should have it's own specific error code to aid in troubleshooting. Example message below.

Feb 27 00:48:12 ip-10-19-177-14 ziti-router[945622]: {"_context":"ch{edge}-\u003eu{classic}-\u003ei{Kxjv}","chSeq":3127866,"connId":5678,"edgeSeq":0,"error":"exceeded maximum [2] retries creating circuit [c/NSv8suZnx]: error creating route for [s/NSv8suZnx] on [r/KZQGYWXKxv] (error creating route for [c/NSv8suZnx]: dial tcp: lookup readacted.servicename..com on 172.17.0.1:53: no such host)","file":"github.com/openziti/ziti/router/xgress_edge/listener.go:199","func":"github.com/openziti/ziti/router/xgress_edge.(*edgeClientConn).processConnect","level":"warning","msg":"failed to dial fabric","time":"2025-02-27T00:48:12.944Z","type":"EdgeConnectType"}