Feat: Restuctured GraphQL Queries and added Backend call service into client. And regerated GraphQL client classes

WotBlitzStatisticsPro.Blazor/graphql/FindPlayers.graphql

@@ -0,0 +1,16 @@
+query findPlayers(
+    $accountNick: String!, 
+    $realmType: RealmType!,
+    $language: RequestLanguage!) {
+  players(
+    accountNick: $accountNick, 
+    realmType: $realmType, 
+    language: $language) {
+      accountId
+      nickname
+      clanTag
+      lastBattle
+      battlesCount
+      winRate
+  }
+}