1176 Fix Firebase phone auth on Android (cla: yes)

1177 Fix bug causing black screen on some Android devices (cla: yes)

1178 [In_app_purchase] iOS add payment dart wrappers (cla: yes)

1180 Expose exception on the signIn method in Google sign in. (cla: yes)

1185 remove extra space (cla: yes)

1193 Mark some packages as unpublishable (cla: yes)

1194 [In_app_purchase] Fix the param map passed down to the platform channel when calling querySkuDetails (cla: yes)

1195 Fix bug where HttpMetric/Trace dictionaries weren’t being initialized on iOS (cla: yes)

1199 [In_app_purchase] fix requesthandler crash (cla: yes)