[APPS-245] Adds a Salesforce_v3 app.

This app works differently from v2 in the following ways:

1. Everything about retrieving data from Salesforce and keeping things in sync is now handled server side. Only thing the client needs to do is hit an API with a parameter to include the ticket ID
2. This app now polls every 3 seconds based on the response from the API. It also now has a lower and upper threshold limit allowing us to assure the user that something is still happening if the server side is taking longer than usual
3. We now maintain the state of the expanded result across tabs.