Ability to send a packet instantly

[MelonHell]

Minestom sends packets to the player every tick, but in some cases, for example for some animations, it is necessary to send packets with a frequency greater than the server's tick rate. It would be very convenient to have a Player::sendPacketInstantly method

[mworzala]

Doing this would require a bunch more synchronization on socket writes, which may have pretty bad performance side effects, although I dont have numbers for this ready to go.