Refinediag and preanalysis yaml specification

[ceblanton]

Is your feature request related to a problem? Please describe.
Refinediag functionality (as defined in Bronx) was developed in Canopy's flow.cylc as a Jinja2/rose-suite setting. We hadn't yet expressed the refinediag (and its cousin that does not generate output, preanalysis) in the yaml configuration.

It's now time to do this, plus require the user scripts to specify their inputs and outputs explicitly. This has long been desired to make refineDiag script requirements known to the workflow.

Describe the solution you'd like
Each refinediag script must specify its inputs and outputs, and each preanalysis script must specify its inputs. The "label" or name of the script is arbitrary and only used for task name organization.

postprocess:
  preanalysis:
    vitals:
      script: "/path/to/vitals-script"
      input: ['atmos_month', 'aerosol_month']
  refinediag:
    ocean:
      script: "/path/to/ocean-script"
      input: ['ocean_monthly', 'ocean_bgc']
      output: ['ocean_refined']
    aerosol:
      script: "/path/to/aerosol-script"
      input: ['aerosol_month']
      output: ['aerosol_refined']

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Additional context
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