show 'number' column in tables of web console

### Description

When showing lists of things like say datasources, show 'item number' next to them (eg a numbered list instead of a bullet list).

### Motivation

Its very helpful to see the 'count' of items. Eg the total number of datasources, total number of segments for a filter, etc. Having a 'number' column helps to know the total number of 'things'

Start in the web console by locating the table and list views for datasources and segments. Determine which lists should show an item-number column and how the total count is currently exposed. Done means the relevant tables consistently display numbering that lets users identify the total number of items.

Written by the indexing model from the issue text.