GroupingChooserModel.dimensions should be settable/updatable

[febbraiod]

No description provided.

[amcclain]

Adding to backlog - if there is any extra priority or push from a client around this pls give a shout.

[febbraiod]

No push or priority. I'm just using a less desirable component to achieve my ends. The client has no problem with what they have now.

[amcclain]

One thing to check here is to ensure that the model handles things reasonably in the case where it already has a current value (a list of selected dimensions to group on) and then a new set of available dimensions is set via this new API. If the current value includes a dimension that is no longer supported, we need to modify it.

We could either clear out the value entirely, or we could strip out only dimensions that are no longer supported. I.e. a groupingChooserModel with value [portfolio, strategy, trader] would have its value automatically reset to [portfolio, trader] if a caller set groupingChooserModel.dimensions = [portfolio, trader, country]