fix: Type in synonym query is now a String instead String[]

[Changelog]

Fixed the type of "SynonymQuery.Type". It's now a String instead
of a List<string>.

For example: Type =  "synonym,oneWaySynonym,placeholder";

https://www.algolia.com/doc/api-reference/api-methods/search-synonyms/#method-param-type

src/Algolia.Search/Models/Synonyms/SynonymQuery.cs

@@ -47,7 +47,7 @@ public SynonymQuery(string query = "")
         /// <summary>
         /// There are 4 synonym types. The parameter can be one of the following values <see cref="Enums.SynonymType"/>
         /// </summary>
-        public List<string> Type { get; set; }
+        public string Type { get; set; }
 
         /// <summary>
         /// Page to retrieve