Add Tcorr index logic for gridded Assets

[macfriedrichs]

Add Tcorr index logic for gridded_cold Assets, similar to the 'DYNAMIC' ruleset for fallback values.

1. Create monthly/annual Gridded_Cold collections
2. Add sorting by index for operational runs (L733)

Something like this?

# Build the Tcorr gridded_cold and fallback collections
     default_coll = ee.ImageCollection(default_dict[tmax_key])\
          .filterMetadata('wrs2_tile', 'equals', self._wrs2_tile)
     annual_coll = ee.ImageCollection(annual_dict[tmax_key])\
          .filterMetadata('wrs2_tile', 'equals', self._wrs2_tile)\
          .select(['tcorr'])
     month_coll = ee.ImageCollection(month_dict[tmax_key])\
          .filterMetadata('wrs2_tile', 'equals', self._wrs2_tile)\
          .filterMetadata('month', 'equals', self._month)\
          .select(['tcorr'])

[cgmorton]

Closing since we no longer the gridded tcorr