v0.2.0

Added

• Dashboard: cds.requires.tokenOptimizer.dashboard serves a web page with charts of
  token usage, cost, calls, failures, savings and latency, at /token-optimizer/dashboard/ by
  default. It covers 24 hours to 90 days from the usage log, plus in-memory statistics of the app
  instance. It is protected by the admin role, has no dependencies and loads nothing from other
  servers. Off by default, and turns the admin service on.
• usage(from, to, interval, groupBy) in the admin service: usage log totals per hour or day
  and per model, use case, CDS service, status or error category, aggregated in the database.
• Fiori elements annotations on UsageLog: list report columns, filters, object page,
  chart, and @Aggregation / @Analytics for analytical list pages and $apply.