Add `/ceffect` that adds effects client side

[m-sarabi]

Now that in Minecraft 1.19 you can not increase gamma to be able to see in dark and /cgamma being broken, I think it is a good time to add a /ceffect add <effect> <time> <multiplier> to add effects to the client. It can only be nightvision effect, but other effects could also be useful. for example:

• /ceffect removeall to remove every effect.
• /ceffect add slowness to move slower, useful for while building
• /ceffect add mining_fatigue to avoid insta mining
• optional --no_particles

[haykam821]

If this command is added, I think it should use the same syntax as the vanilla equivalent, with the exception of the targets argument. Also, as a side note, #428 fixes the issue with /cgamma.

[m-sarabi]

Closing it as /cgamma is fixed