Cache repeated Telecom requests from call log.

This improves call log scrolling performance.

+ Split "Wrapper" into a utility and a cache.
+ Use cache for repeated calls related to call logs.
+ In the process of fixing plumbing and typer, moved some phone call
detail classes into the more appropriate call log package.
+ Update tests.

Bug: 20524705
Change-Id: Ib8ee21e417c19f98f6474a5793416e8f99103b55