[Feature] Allow remove Columns from Source

[Tulesha]

Hello, I have a TreeDataGrid in my project and I would like to remove Columns from it.

As I understand this feature is not available yet. For example, trying to remove Column from HierarchicalTreeDataGridSource throws exception.

Will this feature be implemented in the near future?

[heuristicAL]

Does #148 work for your use-case? I don't know when it will be merged and deployed, though.