Get competitor reports (v4)

Deprecated: use discovery.competitor-reports.get.v5 (discovery_competitor_reports_get_v5), which names no faviconLightUrl or faviconDarkUrl: a favicon is one image for both themes, faviconUrl. This version answers the same and names both, never sent. Read a campaign's competitor report: each brand the conversations named, its share and win rate against the brand, its head-to-head record, and why the brand wins and loses against it, over the campaign's results window (scope.window): every value as of the window's as-of day, averaged over the conversations dated in the 30 days ending it, every trend one point per day (null for a day whose window holds no conversation the value counts), and every change the value minus its value 30 days before the as-of day (null without one).