[release] 1.22.0 - Add GetExperimentLayer (#178)

New method GetExperimentLayer to retrieve the layer name an experiment
belongs to





>Included In This Release
>- ec74201 kat-statsig
>   - get experiment layer (#177)

statsig_metadata.go

@@ -14,7 +14,7 @@ type statsigMetadata struct {
 func getStatsigMetadata() statsigMetadata {
 	return statsigMetadata{
 		SDKType:         "go-sdk",
-		SDKVersion:      "1.21.0",
+		SDKVersion:      "1.22.0",
 		LanguageVersion: runtime.Version()[2:],
 		SessionID:       SessionID(),
 	}