### Description
This PR implements a queue timeout in the lobby server.
* After the time configured in `timeout` has elapsed (default: 3 minutes) since the first player joins the queue, matchmaking will start even if the queue has not reached the `players_per_game` target. Any missing slots will be filled with fake players.
* If the first queued player leaves and other players remain, the timer is recalculated so that matchmaking starts after the `timeout` duration (default: 3 minutes) from the next player’s join time. (After that, the timer continues to be adjusted in the same way whenever the head of the queue changes.)
### Game
Robocraft
### Please confirm
- [x] I am the legal owner or represent the owner of all work submitted
- [x] I consent to my submission being added to this FOSS project
- [x] This PR used LLMs to generate some or all of the code changes
Reviewed-on: https://git.ngram.ca/OpenJam/rc-servers/pulls/71
Reviewed-by: NGnius <ngniusness@gmail.com>
Co-authored-by: MaxSignal <kastera58@gmail.com>
Co-committed-by: MaxSignal <kastera58@gmail.com>
