Add caching service interfaces

Introduced two new interfaces in the Promact.Core.Caching namespace to enhance caching capabilities. The ICachingService interface defines methods for setting, getting, and removing cache values. The ICachingUniqueKeyGenerationService interface provides a method for generating unique cache keys based on provided keys.

Caching/ICachingService.cs

@@ -0,0 +1,9 @@
+namespace Promact.Core.Caching
+{
+    public interface ICachingService
+    {
+        void Set<T>(string key, T value);
+        T Get<T>(string key);
+        void Remove(string key);
+    }
+}

Caching/ICachingUniqueKeyGenerationService.cs

@@ -0,0 +1,7 @@
+namespace Promact.Core.Caching
+{
+    public interface ICachingUniqueKeyGenerationService
+    {
+        string GenerateUniqueKey(string key);
+    }
+}