metricsd: Removing brillo::Any from weaved's public APIs

Weaved replaces brillo::Any with base::Value in its client library,
so need to update clients.

Also this removes last D-Bus dependencies from metrics_collector.

BUG: 26558300
Change-Id: I82d571d7e2bd17347daeb1b70f48ec05378894f0
7 files changed