Add some waffle-guarded connection points to the Credentials service
to start filling out the user flow for Student Records.
Specifically, add a button to the Program Progress Details page if
a certificate exists, and add a link in the Learner Profile page.
Both only appear if the 'student_records' waffle switch is active.
LEARNER-4701
To extract the program detail information edX mobile team has to
parse all the un-necassary details which takes time that ultimately
slows down app.To avoid it,a detail fragment is created that will
be used in the mobile app as well as on the web.
LEARNER-2981
