firebase-ios-sdk

watchOS support for RTDB (#7656)

* Initial attempt for watchOS Database support

* watchOS Package manifest changes for SwiftPM testing.

* Fix iOS compilation

* Further iOS changes

* Further watchOS changes

* Reverted !WATCHOS && 0 change, fixed SharedTestUtils

* Proper logging, using positive if statements

* Properly handle lifecycle changes on watchOS sockets.

Also only log errors if we haven't closed things intentionally.

* Cleanup:

- Removal from outdated sample
- Fixed podspec
- Fixed Swift Package

* Actually restore SwiftPM XCScheme

* Restore ExtensionDelegate.swift

* Revert all changes to ExtensionDelegate.swift

* Cleanup from code review.

* Style

* Added CHANGELOG entry.

* Review comments.

* Style.sh

* Remove unnecessary wrappers for SwiftPM

* Review feedback

* Formatting