feat(metrics): add Prometheus metrics package for Victoria Metrics

Metrics exposed:
- sqs_requests_total{tenant, operation} — request counter
- sqs_request_bytes_total{tenant, operation} — traffic counter
- sqs_request_duration_seconds{operation} — latency histogram
- sqs_errors_total{operation} — error counter
- sqs_queues_count{tenant} — gauge, updated every 15s
- sqs_messages_count{tenant} — gauge, updated every 15s

go.mod

@@ -1,6 +1,6 @@
 module shared-sqs
 
-go 1.22
+go 1.23.0
 
 require (
 	github.com/ghodss/yaml v1.0.0
@@ -11,21 +11,30 @@ require (
 	github.com/mitchellh/copystructure v1.2.0
 	github.com/redis/go-redis/v9 v9.18.0
 	github.com/sirupsen/logrus v1.9.0
-	github.com/stretchr/testify v1.7.0
+	github.com/stretchr/testify v1.11.1
 )
 
 require (
+	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
-	github.com/kr/pretty v0.1.0 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/prometheus/client_golang v1.23.2 // indirect
+	github.com/prometheus/client_model v0.6.2 // indirect
+	github.com/prometheus/common v0.66.1 // indirect
+	github.com/prometheus/procfs v0.16.1 // indirect
+	github.com/rogpeppe/go-internal v1.10.0 // indirect
 	go.uber.org/atomic v1.11.0 // indirect
-	golang.org/x/sys v0.13.0 // indirect
-	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
+	go.yaml.in/yaml/v2 v2.4.2 // indirect
+	golang.org/x/sys v0.35.0 // indirect
+	google.golang.org/protobuf v1.36.8 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
-	gopkg.in/yaml.v3 v3.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
 retract (