Added endpoint to list APIs from whitelist, #PG-5043

[lachiebol]

Description

Need an endpoint to retrieve our whitelist, so we can use in our script on developer docs. This stops us from hard coding lists in different places

Issue No

Steps to Replicate the Issue

Checklist

• [✔] Tested locally or on demo2/demo3?
• [✔] New test case added/updated?
• [NA] Are all newly added texts included via translation?
• [NA] Are text sanitized properly? (Eg use of v-text v/s v-html for vue)
• [NA] Version bumped?
• [NA] Documentation updated?