Log additional data to statsd.

Log additional fields so we can better understand app usage of jobs.
With these fields, we can identify how many jobs are periodic, the
distribution of timing delays apps set, the estimated byte values they
provide (and if they're reasonable based on the device capabilities),
and how many JobWorkItems are queued.

Bug: 138239687
Test: statsd_testdrive 8
Change-Id: I7631dea7abe56cc9dfb4a2db10d623419aea2b54