[Stock-RM] Potential EX gym detection

[iCornflakes]

Port from stock RM

Description

Refer to: https://github.com/RocketMap/RocketMap/pull/2440 Thanks to @KartulUdus for the work!

Motivation and Context

How Has This Been Tested?

On my own server. Working as intented. Might needs testing, but since its merged on stock rm it should be fine.

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.