Added the reject_recently_left_players plugin into the base game

[EraOSBeta]

Steps

• Write a good description of what your PR does (and WHY it does it).
• Add Rikko to CONTRIBUTORS.
• Add a CHANGELOG entry if your change is non-trivial.
• Ensure make preflight completes successfully.

Description

Imagine killing someone, them having to wait 7 seconds to respawn, and they just disconnect and reconnect and they're able to hop in the game immediately without having to wait even a second.

Originally a plugin by @rikkolovescats, this PR disallows any pb-id from joining the session for 10 seconds once the player leaves the session, this system works like the system in the c-layer that disallows people from joining for 10 seconds after they leave, but this system supports disconnections and reconnections, allowing a fair game.

It's also worth noting that this system does not stop people from joining if authenticate_clients is set to false in the config and the player sends a join request to the server before the server fetches the pb-id, this is intentional as the server has requested the client to not be authenticated.

Type of Changes

	Type
✓	✨ New feature

[EraOSBeta]

Also Eric you add the CHANGELOG entry I'm too lazy.

[efroemling]

Thanks for the improvement! My only comment would be to add some comments on what the code is doing, but I'll go ahead and do that.