Add telemetry API and initial set of events

[compulim]

Fixes #2754.

Changelog Entry

Added

• Resolves #2754. Added telemetry system, by @compulim, in PR #2922

Description

This is an initial work, which will enable us to add more metrics sooner.

Although we emit metrics, we do not collect them and there is no default telemetry collector, a.k.a. it just go to void.

While this feature is optional, developers who are interested in our telemetry data will need to write code to integrate our telemetry collection API with service of their choice. If developers decided to collect any data, they should also provide privacy policy to their end-user.

We support 3 types of metrics: event, exception, and timing.

Specific Changes

• Added 4 telemetry hooks
  • useTelemetryDimension, useTelemetryEvent, useTelemetryException, and useTelemetryTiming
• Added telemetry dimensions
  • prop:locale, prop:speechRecognition, prop:speechSynthesis, capability:downscaleImage:workerType
• Added telemetry events
  • init, sendFiles, submitSendBox
• Added telemetry timing
  • sendFiles:makeThumbnail
• Added 2 samples to integrate with Azure Application Insights and Google Analytics

To-do

• Add <ErrorBoundary> for fatal error

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• Testing Added