Convert object to array

Summary:
To send a payload or log metadata, it's convenient

For example, the Laravel logging requires a context as an array.

Test Plan:
Unit tests are provided to cover the new method

First use will be in Notifications Center to log the actions report.

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D2955