Can't filter schemas or tables when creating a group

## Describe the problem

I am trying to create a group on a database with ten schemas. I just want to replicate three of them. Currently I haven't found a way to filter the schema selection on the node where you create the group.

## Describe the proposal

I agree with the default setup to check all the schemas and tables on that database but you should be able to select a subset of them (at schema or table level). This can be done when you join a group but no on group creation. Maybe there is a way to do this but it is unclear to me.

## Describe alternatives

If this can't be done we will have to move replicating schemas to a new database.