JWT OAuth Bearer flow

[BizetaRetailSolutions]

This integration permits the client to authenticate the connection through the JWT bearer token flow.
The activity is linked to open issue #288.

To engage the JWT Bearer flow, the following configuration parameters must be filled:

• username: also used in the login/password flow.
• authEndpoint: used in the login/password flow as well.
• jwtPrivateKey: the private key that will be used to sign the jwt authentication payload.
• clientId: the OAuth client ID, to be used during JWT authentication payload building.
• jwtEndPointUrl: the jwt end point URL to be used when creating a jwt authentication payload.
• jwtLoginUrl: the jwt login URL, to which the built payload will be sent.