CLIMATE-403 - Integrate /parameters/bounds endpoint into UI

- Add getObservationBounds for retrieving bounds information from RCMED.
  This grabs all the parameter information from RCMED and stores it in
  observationBounds.
- Add getBoundsByParameterId helper for retrieving parameter information
  when adding a dataset. If not information is present for the requested
  parameter Id then a default value is returned instead.