quick-n-dirty osf-metrics report ui

[aaxelb]

• Ticket: []
• Feature flag: n/a

Purpose

visually communicate what is publicly available in the osf metrics api

Summary of Changes

• add osf-metrics and osf-metrics.report-detail routes
• load report names and fields from metrics api
• render chart of report values over time (using billboard.js, tho not attached to that library in particular)

Screenshot(s)

Side Effects

QA Notes