[pgAdmin4][Patch]: Tables Sub nodes(Columns, Indexes, rules & triggers) Patch

This patch contains following nodes:

1. Columns

2. Indexes

3  Rule

4. Trigger

I am using murtuza's patch with little changes to show above nodes under view and materialized view.

This patch is only for Tables sub node. @murtuaza is working on table node which is not completed.

Note: Please apply patch for utility function "Added Utility functions for triggers node and rules node" first then apply this patch.

Please review it.

Thanks,

Surinder Kumar