Ranking for on-going season

[FioX0]

While there is an endpoint for rankings for when the season ends.

There has been a very big demand from the community to be able to get ranking from the on-going season.
As targets are selected randomly, there shouldn't be any downsides of making the on-going rankings public.

This pull request would allow someone to pull the on-going rankings, or observe previous rounds rankings by using:
http://localhost:5025/leaderboard/participants?seasonId=23&roundId=38

Which would return a sample result of:

[ { "agentAddress": "cf1270e34b683fb42c9c4339e2a72c3d474f8db4", "avatarAddress": "cf1270e34b683fb42c9c4339e2a72c3d474f8db4", "nameWithHash": "Triplexmazi <size=80%><color=#A68F7E>#cf12</color></size>", "level": 415, "cp": 90566268, "score": 1001 }, { "agentAddress": "d9186d0a270b8ac77407602e198c6bb21db0ac4e", "avatarAddress": "d9186d0a270b8ac77407602e198c6bb21db0ac4e", "nameWithHash": "Satan <size=80%><color=#A68F7E>#d918</color></size>", "level": 414, "cp": 101383775, "score": 1000 }, { "agentAddress": "f9cd29951b3addce2a926955ef22a846fd8b1d06", "avatarAddress": "f9cd29951b3addce2a926955ef22a846fd8b1d06", "nameWithHash": "Harem <size=80%><color=#A68F7E>#f9CD</color></size>", "level": 413, "cp": 49502374, "score": 1000 }, { "agentAddress": "a9843fa08fe952d74b602c29bcab08e2ad7664d3", "avatarAddress": "a9843fa08fe952d74b602c29bcab08e2ad7664d3", "nameWithHash": "Deus <size=80%><color=#A68F7E>#a984</color></size>", "level": 406, "cp": 25282464, "score": 1000 } ]

[Atralupus]

Related to #50

[Atralupus]

Thank you for the PR. I’ll be on vacation, so I’ll be able to review it after November.
I’ll take a look and give you feedback when I’m back.
In the meantime, please check only the failing tests.

[ipdae]

@FioX0 test is broken. can you fix it?

[FioX0]

Added pagination, as per initial suggestion #50

Also resolved the TEST failure, and added a specific test for this new endpoint. I tried to maintain the same structure and commenting style as the previous endpoints.