[PM-12642] Add new ExtendedCache to add caching to template parameters (#6608)

* Add new ExtendedCache to add caching to template parameters

* Added Cache constants for building consistent keys/name, clarified that we are using defaults including TTL, removed as much fusion cache references as possible

src/Core/Utilities/EventIntegrationsCacheConstants.cs

@@ -0,0 +1,52 @@
+using Bit.Core.AdminConsole.Entities;
+using Bit.Core.Models.Data.Organizations.OrganizationUsers;
+
+namespace Bit.Core.Utilities;
+
+/// <summary>
+/// Provides cache key generation helpers and cache name constants for event integration–related entities.
+/// </summary>
+public static class EventIntegrationsCacheConstants
+{
+    /// <summary>
+    /// The base cache name used for storing event integration data.
+    /// </summary>
+    public static readonly string CacheName = "EventIntegrations";
+
+    /// <summary>
+    /// Builds a deterministic cache key for a <see cref="Group"/>.
+    /// </summary>
+    /// <param name="groupId">The unique identifier of the group.</param>
+    /// <returns>
+    /// A cache key for this Group.
+    /// </returns>
+    public static string BuildCacheKeyForGroup(Guid groupId)
+    {
+        return $"Group:{groupId:N}";
+    }
+
+    /// <summary>
+    /// Builds a deterministic cache key for an <see cref="Organization"/>.
+    /// </summary>
+    /// <param name="organizationId">The unique identifier of the organization.</param>
+    /// <returns>
+    /// A cache key for the Organization.
+    /// </returns>
+    public static string BuildCacheKeyForOrganization(Guid organizationId)
+    {
+        return $"Organization:{organizationId:N}";
+    }
+
+    /// <summary>
+    /// Builds a deterministic cache key for an organization user <see cref="OrganizationUserUserDetails"/>.
+    /// </summary>
+    /// <param name="organizationId">The unique identifier of the organization to which the user belongs.</param>
+    /// <param name="userId">The unique identifier of the user.</param>
+    /// <returns>
+    /// A cache key for the user.
+    /// </returns>
+    public static string BuildCacheKeyForOrganizationUser(Guid organizationId, Guid userId)
+    {
+        return $"OrganizationUserUserDetails:{organizationId:N}:{userId:N}";
+    }
+}