Source BingAds: support oauth (java part)

[annalvova05]

Python part

BingAds docs
Necessary scopes values: offline_access user.read

Example of consent url: https://login.microsoftonline.com/common/oauth2/v2.0/authorize?
client_id=
&response_type=code
&redirect_uri=
&response_mode=query
&scope=https://ads.microsoft.com/offline_access%20user.read

Example of token url: https://login.microsoftonline.com/common/oauth2/v2.0/token
-ContentType application/x-www-form-urlencoded
-Method POST
-Body "client_id=$clientId&scope=https://ads.microsoft.com/offline_access%20user.read&code=_code_&grant_type=authorization_code&redirect_uri=_url_"

where accounts, customer_id, developer_token, user_id, reports_start_date, hourly_reports, daily_reports, weekly_reports, monthly_reports should be forwarded from UI part

The BingAds oAuth2 implementation returns refresh_token

[antixar]

duplicate
This issues will be fixed with #6294