Refactor JsonOptions in Constants class

Changed JsonOptions from readonly to static and simplified its initialization to only include PropertyNameCaseInsensitive. Removed unnecessary options for clarity and conciseness.

Author: Timothy Dodd

src/HubitatMqtt/Common/Constants.cs

@@ -3,11 +3,5 @@
 
 public class Constants
 {
-    public static readonly JsonSerializerOptions JsonOptions = new JsonSerializerOptions() 
-    { 
-        PropertyNameCaseInsensitive = true,
-        DefaultIgnoreCondition = System.Text.Json.Serialization.JsonIgnoreCondition.WhenWritingNull,
-        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
-        WriteIndented = false // Optimize for size
-    };
+    public static JsonSerializerOptions JsonOptions = new JsonSerializerOptions() { PropertyNameCaseInsensitive = true };
 }