Added spark-sched-sim to third_party_environments.md

[ArchieGertsman]

Description

I have added a new third party environment: spark-sched-sim.

Type of change

• This change requires a documentation update

Checklist:

• I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes

[pseudo-rnd-thoughts]

The third-party has split into Gymnasium and Gym projects, could you change it to place the project in the gymnasium part (in alphabetical order)

[ArchieGertsman]

The third-party has split into Gymnasium and Gym projects, could you change it to place the project in the gymnasium part (in alphabetical order)

Done!

[pseudo-rnd-thoughts]

Amazing, thanks. I forgot to mention but the project looks really cool. I did some work years ago on cloud resource allocation / job allocation with RL but no way near as cool as this

[ArchieGertsman]

Amazing, thanks. I forgot to mention but the project looks really cool. I did some work years ago on cloud resource allocation / job allocation with RL but no way near as cool as this

Thank you :)