Add project files.

src/common/Elsa.Mediator/Contracts/IEventPublishingStrategy.cs

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+using Elsa.Mediator.Contexts;
+
+namespace Elsa.Mediator.Contracts;
+
+/// <summary>
+/// Represents a strategy for publishing events.
+/// </summary>
+public interface IEventPublishingStrategy
+{
+    /// <summary>
+    /// Publishes an event.
+    /// </summary>
+    /// <param name="context">The context for publishing the event.</param>
+    Task PublishAsync(NotificationStrategyContext context);
+}