Analytics FAQ section - Lifecycle hits

Add a FAQ item about Lifecycle metrics sent in Analytics hits.
One common question I see is about analytics extension sending a separate Lifecycle hit sometimes, but grouping the metrics with track calls other times.

Locate the Analytics FAQ content in the AEP Mobile SDK documentation and review nearby entries for the expected format. Add an FAQ item addressing when Lifecycle metrics are sent as a separate hit versus grouped with track calls, then verify that the wording answers this common question clearly.

Written by the indexing model from the issue text.