Add basic support for the Common Access Token

[dsilhavy]

This PR adds basic support for the Common Access Token as requested in #4395.

• Adds a new CommonAccessTokenController that manages the access tokens for the different hosts
• Adds a new function in Utils to extract the host from a given URL
• Enhances the HttpLoader to call the CommonAccessTokenController for each request and response. The goal is to extract the Common Access Token and save it for future requests. The common-access-token is added for each request to a specific host