Quick play: Matchmaking improvements

[smoogipoo]

• Adjust beatmap rating algorithm (e.g. 800 + 500 * (e^(0.16 * sr) - 1)) (Adjust beatmap rating for higher difficulties at lower SRs #403)
• Add maximum range separation to matchmaking (e.g. ensure players aren't more than 200 rating apart). (Add rating_search_radius_max to matchmaking_pools osu-web#12607 / Limit maximum matchmaking search radius #404).
• Related/similar to the above: rework matchmaking to assess "suitability" of matches with factors:
  • Rating difference
  • Whether players have recently played with one another
  • Whether users are on each others' block lists
  • Whether players have recently abandoned a match
  • Whether players have a provisional rating
  • This is similar to how lichess works: https://github.com/lichess-org/lila/blob/master/modules/pool/src/main/MatchMaking.scala