text: Title: Multiple Profiles
  Body: ## Summary
  I would love it if tableau authentication behaved more [like AWS](https://boto3.amazonaws.com/v1/documentation/api/latest/guide/credentials.html#configuring-credentials)
  
  I obviously can build wrappers for this, but this seems like pretty common functionality in python api packages.  (Databricks,DBT,AWS,etc)
  
  ## Request Type
  I don't believe this would affect or be affected at all by rest API.  as this is just some defaulting and setting before the API. 
  
  ## Description
  Specifically allowing profiles to be specified or defaulting back to environment variables.  
  
  I imagine a profile would have the same information as the call for PAT auth
  
  * token_name
  * personal_access_token
  * site_id
  
  
  