Source Drift: implement oauth2 java-part

[bazarnov]

Halff-ready PR: #7337

There is no dependency on passing additional config parameters for the source-drift

Check the airbyte-oauth/main/flows/DriftChatOauthFlow.java and complete the full circle of authentication.

Using the attached half-ready PR, we need to:

1. add unit for DriftChatOauthFlow.java
2. add integration tests for DriftChatOauthFlow.java
3. test the ready flow for any errors, before merge into master

The link for more details about the Oauth2.0 flow for Drift please follow this:
https://devdocs.drift.com/docs/authentication-and-scopes#1-direct-the-user-to-the-drift-oauth-url-