Add JSDoc and in-line comments to scripts in the platform/telemetry bundle, for WTD-575.
Fix code style, remove Promise from globals where unused. Part of ongoing preparation of platform/telemetry bundle for integration, WTD-575.
Bring in initial state for the platform/telemetry bundle, which provides general-purpose telemetry conventions and infrastructure to support creating domain objects which expose telemetry data. WTD-575.
