API: Get-Activities response shouldn't include distance for activities without distance, example app should correctly handle this as well as absent steps

-- refcator time series calls
-- add time series call to get intraday data

SITE-6364 - Example application does not display existing subscriptions when view subscriptions chosen.

SITE-6849 - Extend example client with water log usecases

-- change example application to support get/add/delete sleep logs

-- add model objects for sleep
-- change api client agent to support sleep calls (get, log, delete)

-- change end point in client agent

-- add send invitation and accept invitation examples

SITE-6523 - Changes to Get-Activities endpoint (distinguish manual directory level records, read steps)