DataGridNumericColumn

[Abrynos]

My idea is to add a DataGridNumericColumn class similar to the already existing DataGridTextColumn that functions similar to this use of DataGridTemplateColumn.

I've already implemented something similar in a project of mine, but it's a bit of a hack and I'd like a proper official implementation.

I'm willing to send a merge request and apply your feedback, but first I'd like to get input from the maintenance team on whether such merge request would be accepted in the first place.