Allow hook for LiveDashboard historical data at client connection

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Generally I’d not use telemetry for retrieving historical data at all. There could be a config like:

config :live_dashboard, MyLiveDashboard,
  historical_data: %{
    [:my_app, :repo, :query] => {MyStorage, :historical_metric_data, []}
  }

Which would make the dashboard run MyStorage.historical_metric_data([:my_app, :repo, :query]) when it comes to rendering a chart for [:my_app, :repo, :query].

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