Supporting setting a default DIALECT for search commands (#147)

* change the structure of AggregationRequest

* add SerializeRedisArgs for FT.AGGREGATE

* fixes

* dialect 2

* try to not use GetArgsAsString

* delete asString

* default dialect

* fix async test

* add tests

* add params tests

* Params > 1 for AggregationRequest

* coverage

* fix

* Query params

* ExplainCli default dialect test

* rename to ModulePrefixes

Author: shacharPash

src/NRedisStack/ModulPrefixes.cs renamed to src/NRedisStack/ModulePrefixes.cs

@@ -2,7 +2,7 @@
 
 namespace NRedisStack.RedisStackCommands
 {
-    public static class ModulPrefixes
+    public static class ModulePrefixes
     {
         public static BloomCommands BF(this IDatabase db) => new BloomCommands(db);
 
@@ -16,7 +16,7 @@ public static class ModulPrefixes
 
         public static TdigestCommands TDIGEST(this IDatabase db) => new TdigestCommands(db);
 
-        public static SearchCommands FT(this IDatabase db) => new SearchCommands(db);
+        public static SearchCommands FT(this IDatabase db, int? searchDialect = null) => new SearchCommands(db, searchDialect);
 
         public static JsonCommands JSON(this IDatabase db) => new JsonCommands(db);