Track activity TTID span automatically

[abhaysood]

Description

Track activity load timing using spans. The span must start when activity is first created and should end when the first frame of the activity is drawn. Also, add span checkpoints for lifecycle events - onCreate, onStart and onResume.

This feature should be disabled by default. To enable collection the following configurations should be allowed

Span name: TBD, possibly Activity TTID {fully qualified class name of activity}

Configuration

The feature will be disabled by default. It can be enabled using this config, which will start collecting the spans for all activities.

MeasureConfig(enableActivityTtidSpan: bool)

Out of scope

• Fine grained control on which activities to report TTID for.
• Adding custom attributes to the span