[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?

[giard-alexandre]

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

[danwalmsley]

fixed by

#310

#311