Adds new hidable context menu option for ColumnHeaders
#6729
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Motivation for features / changes
Before enabling context menus for scalar card tables, it will be useful to explicitly distinguish the two different removal related column interactions that are currently available: "remove" and "hide". "Removed" columns must be re-added to display again (this is what's currently done for hparams in the runs table). "Hidden" columns can be re-enabled via the "edit table columns" (this is only available in scalar tables).
Distinguishing these two operations also provides an easy way to provide similar but different hparam columns for the runs and scalar tables: first add the hparams that you need to both tables, then hide the ones you don't need in the scalar tables.
Technical description of changes
hidableproperty to the ColumnHeader type.| run | hparam_columns | other_columns |Detailed steps to verify changes work correctly (as executed by you)