Allow sendFeedback() to accept an event id

[billyvg]

This will allow us to use the new feedback API to be able to support "crash reports" by associating the feedback event with an event id. Using this new API also allows us to resolve the issue where the feedback environment does not match the event environment (assuming users use the new API instead of captureUserFeedback).

We would need to set associated_event_id in the feedback context if an event id is passed into sendFeedback().

[mydea]

merged this into #10953!