feat: add helix extension api endpoints

[iProdigy]

Prerequisites for Code Changes

• This pull request follows the code style of the project
• I have tested this feature

Related Issues

• Work towards Extensions module should be migrated to helix #445
• Twitch inconsistencies: Get User Extensions returns active extensions only and not installed extension twitchdev/issues#477, Wrong pagination parameter in documention for /extensions/live endpoint twitchdev/issues#524, extensions/live not a "fixed" order twitchdev/issues#539, extensions/live pagination broken twitchdev/issues#540, extensions/live pagination inconsistent with the rest of helix twitchdev/issues#541, Set Extension Required Configuration - incomplete/incorrect twitchdev/issues#569, expiration sticky in the response array of "Get Extension Bits Products" twitchdev/issues#572, [Docs] Incorrectly listed requirement for Send Extension Chat Message Endpoint twitchdev/issues#577

Changes Proposed

• Add Helix Extension APIs