Add Sentry features to Samples

[lucas-zimerman]

The following functions should be used on the sample app:

• startInactiveSpan
• startSpan
• startSpanManual
• getActiveSpan
• spanToJSON
• spanIsSampled
• setMeasurement
• getGlobalScope
• getIsolationScope
• getClient
• setCurrentClient
• metrics

[github-actions]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀