Implement summoning pity rates (#849)

First half of #698 

- Refactor summoning odds calculation into static pure functions to make
  them easier to test
- Add new pity counter column to DbPlayerBannerData

This does not activate the pity rate calculation for actual results;
everyone will have a counter of 0 which will not accumulate.

The algorithm for pity rates is somewhat empirical based on a random
screenshot and may not distribute the .5% increases in the exact way
that the game originally did.

.config/dotnet-tools.json

@@ -6,19 +6,22 @@
       "version": "0.6.4",
       "commands": [
         "husky"
-      ]
+      ],
+      "rollForward": false
     },
     "csharpier": {
       "version": "0.28.2",
       "commands": [
         "dotnet-csharpier"
-      ]
+      ],
+      "rollForward": false
     },
     "dotnet-ef": {
-      "version": "8.0.4",
+      "version": "8.0.6",
       "commands": [
         "dotnet-ef"
-      ]
+      ],
+      "rollForward": false
     }
   }
 }

DragaliaAPI/DragaliaAPI.Database/Entities/DbPlayerBannerData.cs

@@ -14,14 +14,12 @@ public class DbPlayerBannerData : DbPlayerData
     [Required]
     public int SummonBannerId { get; set; }
 
-    [Column("Pity")]
-    [Required]
-    public byte PityRate { get; set; }
-
     [Column("SummonCount")]
     [Required]
     public int SummonCount { get; set; }
 
+    public int SummonCountSinceLastFiveStar { get; set; }
+
     [Column("DailyLimitedSummons")]
     [Required]
     public int DailyLimitedSummonCount { get; set; }