Segmentation tvOS, macOS, and CI (#6947)

FirebaseSegmentation.podspec

@@ -15,6 +15,9 @@ Firebase Segmentation enables you to associate your custom application instance
   }
 
   s.ios.deployment_target = '10.0'
+  s.osx.deployment_target = '10.12'
+  s.tvos.deployment_target = '10.0'
+
   s.cocoapods_version = '>= 1.4.0'
   s.static_framework = true
   s.prefix_header_file = false