Join client and user tables

[Bvr4]

Detailed Description

Add an optional 0-n relation between client and users.
This issue is an extension of the issue #148

Context

nice to know how clients and users are related.

Possible Implementation

optional 0-n relation between client and users
optional 0-n relation between client and user_site_groups
function assign_user_to_client

[peterdudfield]

Probably good to have a assign_user_site_group_to_client group too, if thats ok

[hanaawad24]

Hi - What is the status on this ? I would like to take it

[peterdudfield]

We are pausing this issue in this repo. We will be moving over to a new data platform. More information to come on this.