[AMCUFA OAuth] Add /authorize api to UI, async .JS(Ajax) with popup click

[Immanuel I George]

• AMCUFA solution UI will perform async Ajax calls in the background periodically by calling /validate_request.
• AMCUFA solution UI will /validate_request for every initiated api requests that needs AMC access.
  * AMCUFA solution UI will call /authorize with auth code parameters if /validate_request returns with an authorize_url pop_up.
  * Auth token comes back as a param in the return url (provided by /validate_request) and it is to be used within 5 minutes to generate an access and refresh token using /authorize . [ref]
  * When user clicks logout on the solution /reset_token is called.
  *