[exporter/skywalking] Add skywalking metrics exporter

exporter/skywalkingexporter/go.mod

@@ -9,7 +9,14 @@ require (
 )
 
 require (
-	cloud.google.com/go v0.81.0 // indirect
+	github.com/open-telemetry/opentelemetry-collector-contrib/internal/coreinternal v0.41.0
+	github.com/rogpeppe/go-internal v1.8.0 // indirect
+	google.golang.org/grpc v1.43.0
+	skywalking.apache.org/repo/goapi v0.0.0-20211122071111-ffc517fbfe21
+)
+
+require (
+	cloud.google.com/go v0.99.0 // indirect
 	github.com/cenkalti/backoff/v4 v4.1.2 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/go-logr/logr v1.2.1 // indirect
@@ -34,22 +41,15 @@ require (
 	go.uber.org/atomic v1.9.0 // indirect
 	go.uber.org/multierr v1.7.0 // indirect
 	go.uber.org/zap v1.19.1 // indirect
-	golang.org/x/net v0.0.0-20210614182718-04defd469f4e // indirect
-	golang.org/x/oauth2 v0.0.0-20210514164344-f6687ab2804c // indirect
-	golang.org/x/sys v0.0.0-20211013075003-97ac67df715c // indirect
-	golang.org/x/text v0.3.6 // indirect
+	golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d // indirect
+	golang.org/x/oauth2 v0.0.0-20211104180415-d3ed0bb246c8 // indirect
+	golang.org/x/sys v0.0.0-20211205182925-97ca703d548d // indirect
+	golang.org/x/text v0.3.7 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
-	google.golang.org/genproto v0.0.0-20210624195500-8bfb893ecb84 // indirect
+	google.golang.org/genproto v0.0.0-20211208223120-3a66f561d7aa // indirect
 	google.golang.org/protobuf v1.27.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
 )
 
-require (
-	github.com/open-telemetry/opentelemetry-collector-contrib/internal/coreinternal v0.41.0
-	github.com/rogpeppe/go-internal v1.8.0 // indirect
-	google.golang.org/grpc v1.43.0
-	skywalking.apache.org/repo/goapi v0.0.0-20211122071111-ffc517fbfe21
-)
-
 replace github.com/open-telemetry/opentelemetry-collector-contrib/internal/coreinternal => ../../internal/coreinternal