Add Bearer Token support for HTTP authentication

[che-spotnana]

Is your feature request related to a problem? Please describe.
Now it only support Basic authentication, does not support Bearer Token.

Describe the solution you'd like
Add the BearerHttpAuthenticator and its config

Describe alternatives you've considered

Additional context

[klisira]

Hey, you can pass the bearer token in the configuration of the connector like this:
"http.request.headers": "Authorization: Bearer <your_actual_token>"