on notification ios does not work on cold start

[ghost]

Description

Reimplemented the cold start logic from an old version (the ~1.0.0.)
Maybe the code was lost during various merges.

• Changed the Firebase import to allow correct code compile.

Related Issue

#2629

Motivation and Context

on('notification') handler now will be called also on cold start. (When app is inactive)

How Has This Been Tested?

Real project in production.

Screenshots (if appropriate):

Types of changes

• [ x] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[yeliu84]

Is there an ETA of merging this PR? I've been having this issue for a long time.