Fix plugin imports using product-level CocoaPods

[gillycheesesteak]

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Documentation changes
• Other... Please describe:

PR Checklist

Please check your PR fulfills the following requirements:

Bugfixes:

• Regression testing has been carried out using the example project to ensure the intended bug is fixed and no regression bugs have been inadvertently introduced.

New features/enhancements:

• Exhaustive testing has been carried out for the new functionality
• Regression testing has been carried out to ensure no existing functionality is adversely affected
• Documentation has been added / updated
• The example project has been update to validate/demonstrate the new functionality.

What is the purpose of this PR?

The switch to product pods (#811) broke builds because of the missing Firebase.h file. This adds FirebaseWrapper.h which replicates the behavior of that file from the top-level Firebase pod.

It also removes some code that attempts to modify the plugin.xml file before the first pod install to use the pre-built Firestore, which was not functioning because Cordova reads the plugin.xml file into memory before firing that hook.

NOTE: The precompiled Firestore flag still does not work because of the issue described here: invertase/firestore-ios-sdk-frameworks#62

Does this PR introduce a breaking change?

• Yes
• No

What testing has been done on the changes in the PR?

What testing has been done on existing functionality?

Other information

[sestienne]

Thanks a lot your solution works very.
I do not force to use precompile firestore pod file by changing plugin.xml as we build on a Mac M1 (see error : ld: symbol(s) not found for architecture arm64, open issue : invertase/firestore-ios-sdk-frameworks#71)

[mehmetkaynak]

any updates?

[ensemblebd]

Really appreciate your work to resolve this.
Just wish I had seen this sooner, wasted a solid 6+ hours, searching for why "Firebase.h" didn't exist, and ending up in rabbit-hole after rabbit-hole.

Hoping to see it merged into main soon.
Tested functional for me as well. (note: I'm also on an M1 chip, & project is meteorjs cordova)