NEXUS-6183: Returned stopwatch for outbound logging purposes

For now by returning Stopwatch in game.

As Yammer does not provide clean way to extract the
"last recorded duration" from timer or timer context in
cheap way.

Issue
https://issues.sonatype.org/browse/NEXUS-6183

CI
https://bamboo.zion.sonatype.com/browse/NX-OSSF10