Add doesUsenameExist query

Reviewed-on: #107

src/operations/user.gql

@@ -131,3 +131,7 @@ query getUserFollowingFollowers {
     }
   }
 }
+
+query doesUsernameExist($candidateUsername: String!) {
+  doesUsernameExist(candidateUsername: $candidateUsername)
+}

src/schema.gql

@@ -9,6 +9,7 @@ type Query {
     videoId: ID!
     intervalDuration: Int! = 300
   ): [MakePercentageIntervalGQL!]!
+  getMedals(scope: MedalScope!, userId: Int = null): RequestedMedalsGQL!
   getOrderedShots(
     filterInput: FilterInput!
     ids: [Int!] = null
@@ -267,6 +268,52 @@ type MakePercentageIntervalGQL {
   elapsedTime: Float!
 }
 
+type RequestedMedalsGQL {
+  distanceOver66: MedalGQL
+  distanceOver78: MedalGQL
+  distanceOver90: MedalGQL
+  runLength3: MedalGQL
+  runLength5: MedalGQL
+  runLength8: MedalGQL
+  runLength10: MedalGQL
+  runLength15: MedalGQL
+  runLength20: MedalGQL
+  runLength25: MedalGQL
+  runLength30: MedalGQL
+  runLength40: MedalGQL
+  runLength50: MedalGQL
+  totalMakes25: MedalGQL
+  totalMakes50: MedalGQL
+  totalMakes75: MedalGQL
+  totalMakes100: MedalGQL
+  totalMakes200: MedalGQL
+  totalMakes300: MedalGQL
+  totalMakes400: MedalGQL
+  totalMakes500: MedalGQL
+  totalMakes750: MedalGQL
+  totalMakes1000: MedalGQL
+  dayStreak2: MedalGQL
+  dayStreak3: MedalGQL
+  dayStreak4: MedalGQL
+  dayStreak5: MedalGQL
+  dayStreak6: MedalGQL
+  dayStreak7: MedalGQL
+  dayStreak14: MedalGQL
+  dayStreak21: MedalGQL
+  dayStreak30: MedalGQL
+  dayStreak60: MedalGQL
+  dayStreak90: MedalGQL
+}
+
+type MedalGQL {
+  count: Int!
+}
+
+input MedalScope @oneOf {
+  videoId: Int
+  interval: TimeInterval
+}
+
 type GetShotsResult {
   shots: [ShotGQL!]!
   count: Int