QC #1 - Update SURFACE QC range features

[scottylad501]

Use seasonal(monthly) thresholds from station for reference or global range thresholds

ALSO create QC reference stations based on the mappings in the attached document

QC_Range_Station_Mapping.xlsx

This should be added to NEW STATION metadata

[fabiosato]

@AbnerBissolli first let's clean the code by removing functions/queries in tasks.py related to the QC range test that are not being used and also remove qc range unused columns in StationVariable model.

[fabiosato]

Implementation steps:

1 - Add 'reference_station' field to wx.Station model. This should be a foreign key pointing to the same table. 2 - Update insert_raw_data.py at line 128 with the following logic:

• get range thresholds from QcRangeThreshold using station_id, variable_id, interval, and month - for this step keep the current logic
• if there's no threshold for above combination, get range thresholds from QcRangeThreshold using (reference_station id, variable_id, interval, month)
• if there's no threshold for above use global range thresholds from Variable