code refactored for email-passwordless and jwt login provider

Signed-off-by: Gaurav Goel <[email protected]>

Author: grvgoel81

Assets/Plugins/Web3AuthSDK/Web3Auth.cs

@@ -258,7 +258,11 @@ private async void request(string path, LoginParams loginParams = null, Dictiona
                 (paramMap["params"] as Dictionary<string, object>)[item.Key] = item.Value;
             }
 
-        string loginId = await createSession(JsonConvert.SerializeObject(paramMap), 600);
+        string loginId = await createSession(JsonConvert.SerializeObject(paramMap, Newtonsoft.Json.Formatting.None,
+            new JsonSerializerSettings
+                {
+                     NullValueHandling = NullValueHandling.Ignore
+                }), 600);
 
         if(!string.IsNullOrEmpty(loginId)) {
             var loginIdObject = new Dictionary<string, string>