Add Live Activity to example project

[fhboswell]

Description

One Line Summary

Add Live Activity to example project.

How To Use

To try this out, scroll down in the dev app until you see the Live Activity section, under that you will see a button called "Start Live Activity" tap this button and navigate to the Lock Screen

Affected code checklist

These changes only affect the example app.

Checklist

Overview

• PR does one thing
  • If it is hard to explain how any codes changes are related to each other then it most likely needs to be more than one PR

Testing

• I have personally tested this on my device, or explained why that is not possible

Final pass

• Code is as readable as possible.
  • Simplify with less code, followed by splitting up code into well named functions and variables, followed by adding comments to the code.
• I have reviewed this PR myself, ensuring it meets each checklist item
  • WIP (Work In Progress) is ok, but explain what is still in progress and what you would like feedback on. Start the PR title with "WIP" to indicate this.

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This change is