CLOUDP-279932: SDK based authentication

[wtrocki]

Description

Integration with Credentials module in Atlas CLI

WIP - Intention is to provide demo for authentication capability.
In PR I have flagged number of areas that will need to be done for proper integration.
PR will not be merged, but it can be used as base for future Auth Integration

Testing

1. Create profile /bin/atlas config edit --profile auth-test --debug

[auth-test]
output = 'json'
ops_manager_url = 'https://cloud-dev.mongodb.com'
org_id = '6707a96bc2b066602a4dfdcc'
project_id = '670ce177f33cea212ea202a5'
public_api_key = 'your sa id'
private_api_key = 'your sa secret'

or setup profile using cli

/bin/atlas config init --profile auth-test
? Service Account Client ID: ****************
? Service Account Secret: [? for help] ************************
😘 

2. Run API call (command)

./bin/atlas clusters list --profile auth-test --debug

Result:

{"links":[{"href":"https://cloud-dev.mongodb.com/api/atlas/v2/groups/670ce177f33cea212ea202a5/clusters?includeCount=true&includeDeletedWithRetainedBackups=false&pageNum=1&itemsPerPage=100","rel":"self"}],"results":[],"totalCount":0}
{
  "links": [
    {
      "href": "https://cloud-dev.mongodb.com/api/atlas/v2/groups/670ce177f33cea212ea202a5/clusters?includeCount=true\u0026includeDeletedWithRetainedBackups=false\u0026pageNum=1\u0026itemsPerPage=100",
      "rel": "self"
    }
  ],
  "results": [],
  "totalCount": 0
}

[gssbzn]

@wtrocki good to close this PoC?