Feature request: add maximum skill tier achieved to lifetime stats

[cklugewicz]

I believe that adding maximum visual skill tier achieved (both lifetime and for the current season) to the stats available from the /players endpoint would be extremely helpful. For the most utility, the maximum VST should be expressed as a point value, not simply as one of the 30 named skill tiers.

As an example of the players object with the proposed fields added:

{
      "type": "player",
      "id": "eb9063bc-129c-11e5-b365-06eb725f8a76",
      "attributes": {
        "createdAt": "2017-05-21T13:26:35Z",
        "name": "hazeleyes",
        "shardId": "na",
        "stats": {
          "karmaLevel": 2,
          "level": 30,
          "lifetimeGold": 14740.6650390625,
          "lossStreak": 0,
          "played": 3087,
          "played_ranked": 1562,
          "skillTier": 11,
          "maxLifetimeVST": 1465,
          "maxSeasonVST": 1338,
          "winStreak": 0,
          "wins": 1585,
          "xp": 175450
        },
        "titleId": "semc-vainglory"
      },
      "relationships": {
        "assets": {
          "data": []
        }
      }
    }
  ],
  "links": {
    "self": "https://api.dc01.gamelockerapp.com/shards/na/players"
  },
  "meta": {}
}

It has been requested separately to change the "skillTier" value above to the actual points value, but I haven't included that above, even though I agree with that proposal also.

[svperfecta]

@cklugewicz So wondering - If you looked at player (soon to be participant per #145 ) over time, you'd be able to derive max skill tier right? I believe this is available (though it might take a bit of work). It's not available over lifetime, but really this season is what's relevant (changes to meta over time and all).