firebase-ios-sdk

Re-enable HTTPSCallableTests (#8265)

* Cache FIRStorage instances by app

* changelog

* nuts

* format

* appease the code coverage bot

* storage -> functions

* style

* appease codecov again

* Go the component way

* doc comments and style

* fix copyrights

* Fix bad import

* nit

* make it threadsafe

* attempt to fix swift test

* fix tests again

* debug

* Disable Combine tests

* allow subclasses in functions component

* reenable test

* Remove class check

* style

* Add changelog