Make timeaverage switch per-component

[singhd789]

Is your feature request related to a problem? Please describe.
Currently do_timeavgs is a per-experiment switch in the yaml framework in the [shared][postprocess][switches] section . User's would like this to be per-component as some components involve time averaging and some do not.

Describe the solution you'd like
An option would be to include the switch with the specific component information

 components:
    - type: "atmos"
      sources: "atmos_month"
      sourceGrid: "cubedsphere"
      xyInterp: *PP_XYINTERP96
      interpMethod: "conserve_order2"
      inputRealm: 'atmos'
      timeAverage: True

Ensure proper handling of this change in workflow.