Automatic field type guessing is wrong sometimes

[ptormene]

This happens for instance when we download a csv oq-engine output into a QGIS table.
For instance a column "year" that contains all 1 values is automatically assigned boolean type, so in the loaded table all values are displayed as true instead of 1.
In order to obtain correct field types, we would need to get those types from the engine (for instance though a API call that would take in input the output type and would return a dict like {field[name]: field[type] for field in output_fields}