Build a service to handle (two-person) approvals

Problem to solve

Currently, there's no way to handle approvals for two-person approvals. There isn't any experience, feature, or mechanism to handles these approvals, which will be critical for providing the functionality of two-person approvals for compliance-minded organizations.

Proposal

Create the backend infrastructure to support the two-person approval feature with a mechanism to handle approvals.

From @tancnle's proposed breakdown

• Verify eligibility
  • feature enabled
  • licensed
  • approver's permissions (e.g roles)
• Update approval request status to be approved
• Apply setting changes
• Record audit event
• Notify requestor