Implements PAR request to prefill user information

[mohssenfathi]

Description

Adding support for prefill values. This was a feature of the existing SDK that is being migrated to the new UberAuth, so logic should be fairly similar.

NetworkProvider

This is a network utility used to make the PAR request. There is a similar class in UberCore, but since it will be removed I recreated in UberAuth

ParRequest

This is the request builder for the PAR endpoint. Should be similar to AuthorizeRequest, but with different values.

Scope Changes

I reduced the scope of several classes where possible.

Testing

• Manual testing -- Use the sample app and test client id 9QZcD_Ki6NbhGCrVXSUHCxfevm-C9Khj to test changes

Demo

par.mp4