Add new methods to ICachingService interface

- Added `using System.Collections.Generic;` to utilize collections.
- Introduced `GetAllKeys()` method to return all cache keys as a `HashSet<string>`.
- Implemented `GetAll()` method to fetch all cache entries as an `IDictionary<string, string>`.

Caching/ICachingService.cs

@@ -1,9 +1,13 @@
-namespace Promact.Core.Caching
+using System.Collections.Generic;
+
+namespace Promact.Core.Caching
 {
     public interface ICachingService
     {
         void Set<T>(string key, T value);
         T Get<T>(string key);
         void Remove(string key);
+        HashSet<string> GetAllKeys();
+        IDictionary<string, string> GetAll();
     }
 }

Promact.Core.csproj

@@ -9,9 +9,9 @@
     <PackageProjectUrl>https://github.com/Promact/Core</PackageProjectUrl>    
     <RepositoryUrl>https://github.com/Promact/Core</RepositoryUrl>
     <PackageReadmeFile>README.md</PackageReadmeFile>
-    <AssemblyVersion>1.0.0.2</AssemblyVersion>
-    <FileVersion>1.0.0.2</FileVersion>
-    <Version>1.0.0.2</Version>
+    <AssemblyVersion>1.0.0.3</AssemblyVersion>
+    <FileVersion>1.0.0.3</FileVersion>
+    <Version>1.0.0.3</Version>
   </PropertyGroup>
 
   <ItemGroup>