firebase-ios-sdk

FirebaseInstallations: CreateInstallation API request error handling (#4024)

* Unrecoverable errors: basic unit tests defined.

* Registration Error models introduced.

* Storage: storage version handling fix.

* Formatting.

* Get Installation: return registration error from previous attempt.

* Retry registration request on configuration change.

* Store unrecoverable registration error.

* FIRInstallations Swift API improvements.

* Add Swift integration tests

* Revert "Add Swift integration tests"

This reverts commit a8e06418be56746df82333edae81cff1b4d2e73f.

* Invalid config integration tests and fixes.

* Missing tests and cleanup.

* ./scripts/style.sh

* Log messages.

* More elaborative log message. Typo.

* Reorganize imports and umberella header to fix Swift compilation errors.

* Formatting.