added codeowners for the acs common modality
# PRLabel: %Communication
/sdk/communication/ @JianpingChen @Azure/azure-sdk-communication-code-reviewers
+# PRLabel: %Communication - Common
+/sdk/communication/azure-communication-common/ @Azure/acs-identity-sdk @petrsvihlik @AikoBB @maximrytych-ms @ostoliarova-msft @mjafferi-msft
+
# PRLabel: %Azure.Core
/sdk/core/ @vcolin7 @anuchandy
