Clean up available operators in Prediacte editor

There is some mystery in the way the available operators are computed for each different field type in the Predicate Editor dialog of the Page Provider feature in Studio.
Here is a matrix of the current status : https://hylandsw-my.sharepoint.com/:x:/g/personal/yannis_julienne_hyland_com/EYAfdczasPRNvxZz_SPdxMABJVsO19beA4LWVbCzMfyjag?e=vwRhDq