Socket routing improvements, unit test cleanup (#276)

Updated WebSocket message routing improving performance for scenarios with multiple different subscriptions and topics
Added AddCommaSeparated helper for Enum value arrays to ParameterCollection
Improved EnumConverter performance and removed string allocation for happy path
Fixed CreateParamString extension method for ArrayParametersSerialization.Json
Fixed Shared GetOrderBookOptions and GetRecentTradeOptions base validations not being called

CryptoExchange.Net.UnitTests/Implementations/TestObject.cs

@@ -0,0 +1,14 @@
+using System.Text.Json.Serialization;
+
+namespace CryptoExchange.Net.UnitTests.Implementations
+{
+    public class TestObject
+    {
+        [JsonPropertyName("other")]
+        public string StringData { get; set; } = string.Empty;
+        [JsonPropertyName("intData")]
+        public int IntData { get; set; }
+        [JsonPropertyName("decimalData")]
+        public decimal DecimalData { get; set; }
+    }
+}