Update page sdk init to handle delayed setting of window.OneSignalDeferred

[fadi-george]

Description

1 Line Summary

• Update logic for processOneSignalDeferredArray to address [Bug]: Uncaught TypeError: e is not iterable at o.processOneSignalDeferredArray #1210

Details

If window.OneSignalDeferred is not set in time before processOneSignalDeferredArray is called, it will lead to an is not iterable error.

• So added a nullish coalescing check before the process call
• Removed OneSignalDeferred class and just update the push property of window.OneSignalDeferred for better typings / simplicity
• Improved global typings for OneSignal and OneSignalDeferred

Systems Affected

• WebSDK
• Backend
• Dashboard

Validation

Tests

Info

Checklist

• All the automated tests pass or I explained why that is not possible
• I have personally tested this on my machine or explained why that is not possible
• I have included test coverage for these changes or explained why they are not needed

Programming Checklist
Interfaces:

• Don't use default export
• New interfaces are in model files

Functions:

• Don't use default export
• All function signatures have return types
• Helpers should not access any data but rather be given the data to operate on.

Typescript:

• No Typescript warnings
• Avoid silencing null/undefined warnings with the exclamation point

Other:

• Iteration: refrain from using elem of array syntax. Prefer forEach or use map
• Avoid using global OneSignal accessor for context if possible. Instead, we can pass it to function/constructor so that we don't call OneSignal.context

Screenshots

Info

Checklist

• I have included screenshots/recordings of the intended results or explained why they are not needed

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Related Tickets

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This change is 

[jkasten2]

Code changes look good, only noticed one extra console.log that should be cleaned up.