Refactor: renaming proposals

[tangrammer]

Following a few ideas trying to easy the understanding of DRP design

To use business instead of covered-business. IMO under the umbrella of DRP, a business could be considered automatically covered thus we don't need to be redundant here.
To not use AuthorizedAgent but just UserAgent that can exercise authorized DRR. So, considering authorization as a compulsory property to exercise DRRs. Then as compulsory one we don't need to be explicit about it .
To use BusinessAgent(BA) instead of PIP, that way we can derive that the role of UA with the User is almost identical than the role of Business with PIP/BA. Then we could simplify the desing as U <--> UA <--> BA <--> B. Making a bit generic .... A DataRightsAgent (DRA) is encharged of recieving DRR state changes, track and dispatch them.

thanks for reading and ... looking forward your thoughts 😄