at_c: APKAM command builders in packages/atauth

[JeremyTubongbanua]

We have our own way of doing enrollment requests, approvals, etc,.

• atauth_enrollment_request - user requests for namespace access in atSign | unauthorized app requests for namespace access from authorized app
• atauth_enrollment_approve - authorized app (with atSign keys) approves the user for namespace access
• atauth_enrollment_deny - authorized app (with atSign keys) denies the user for namespace access
• atauth_enrollment_list - authorized app (with atSign keys) lists all the enrolment requests from users
• atauth_enrollment_revoke - authorized app (with atSign keys), when an enrolment request was approved once, can be taken away

[srieteja]

To get at_activate over the finish line only enroll:request is required. And that has been implemented. Will take up the rest of the builders once at_activate is finished. Relevant code will be a part of the at_activate PR which is still a draft. Will link the PR once it is ready.

[srieteja]

Assigning 3SP to implement the rest of the command builders.