Record lastProgressTime in ImeTrackerService

By default ImeTracker does not log onProgress calls. This makes
analyzing timed out requests more challenging, as we cannot tell when
the last progress was received.

This adds a mLastProgressTime field to the ImeTracker history entry,
initialized to the start time, updated for every onProgress, and
included in the dump only for timed out requests.

Flag: EXEMPT logging
Bug: 416428541
Test: adb shell dumpsys input_method
Change-Id: I3bd7f73bb5c131b64c8367f281576cd5fc4b3135