feat: Add Exception type for Event errors (#217)

Co-authored-by: Lucas Pedroza <[email protected]>

Fauna.Test/Integration.Tests.cs

@@ -684,7 +684,7 @@ await _client.EventFeedAsync<StreamingSandbox>(FQL($"42"))
     [Test, Category("EventFeed")]
     public void ThrowsWhenStartTsIsTooOld()
     {
-        var ex = Assert.ThrowsAsync<FaunaException>(async () =>
+        var ex = Assert.ThrowsAsync<EventException>(async () =>
             {
                 long aYearAgo = DateTimeOffset.UtcNow.AddYears(-1).ToUnixTimeMilliseconds() * 1000;
                 var feed = await _client.EventFeedAsync<StreamingSandbox>(

Fauna/Exceptions/EventException.cs

@@ -0,0 +1,15 @@
+using Fauna.Core;
+
+namespace Fauna.Exceptions;
+
+/// <summary>
+/// Represents an exception related to Fauna Event Stream and Event Feed errors.
+/// </summary>
+public class EventException : ServiceException
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="EventException"/> class.
+    /// </summary>
+    /// <param name="err">The <see cref="ErrorInfo"/> from which to extract a message.</param>
+    public EventException(ErrorInfo err) : base(message: err.Message!) { }
+}

Fauna/Types/Event.cs

@@ -65,13 +65,13 @@ public class Event<T> where T : notnull
     /// <param name="json">JSON Element to convert.</param>
     /// <param name="ctx">A mapping context to influence deserialization.</param>
     /// <returns>An instance of <see cref="Event{T}"/>.</returns>
-    /// <exception cref="FaunaException">Thrown when the event includes a Fauna error.</exception>
+    /// <exception cref="EventException">Thrown when the event includes a Fauna error.</exception>
     internal static Event<T> From(JsonElement json, MappingContext ctx)
     {
         var err = GetError(json);
         if (err != null)
         {
-            throw new FaunaException(err.Value);
+            throw new EventException(err.Value);
         }
 
         var evt = new Event<T>