Include the dump time and warning at the end of each Dumpable dump

To track down dumpables that are taking too long, add the duration of their dump to the end of their dump output.
Also adds `dumpsysui all` command for simpler testing.

Test: atest DumpHandlerTest
Test: dumpsysui bugreport-critical
Test: dumpsysui all
Bug: 292221335
Change-Id: Ic2b99e7ba0ebc68aa887473aeb055da8317f0e62