Build: Bundle Size Checks

[hborawski]

Is your feature request related to a problem? Please describe.

As a user of Player UI, I want to understand the size implications of including the framework in my applications

As a developer / contributor to Player UI, I want to have size information about the framework surfaced on my pull request, so I can make informed decisions when adding features.

Describe the solution you'd like

Add a stage into the CI process for builds to collect size metrics for Player for each platform (core, React, iOS, Android).

Additional context