[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

test/Core.Test/Utilities/EventIntegrationsCacheConstantsTests.cs

@@ -0,0 +1,41 @@
+using Bit.Core.Utilities;
+using Bit.Test.Common.AutoFixture.Attributes;
+using Xunit;
+
+namespace Bit.Core.Test.Utilities;
+
+public class EventIntegrationsCacheConstantsTests
+{
+    [Theory, BitAutoData]
+    public void BuildCacheKeyForGroup_ReturnsExpectedKey(Guid groupId)
+    {
+        var expected = $"Group:{groupId:N}";
+        var key = EventIntegrationsCacheConstants.BuildCacheKeyForGroup(groupId);
+
+        Assert.Equal(expected, key);
+    }
+
+    [Theory, BitAutoData]
+    public void BuildCacheKeyForOrganization_ReturnsExpectedKey(Guid orgId)
+    {
+        var expected = $"Organization:{orgId:N}";
+        var key = EventIntegrationsCacheConstants.BuildCacheKeyForOrganization(orgId);
+
+        Assert.Equal(expected, key);
+    }
+
+    [Theory, BitAutoData]
+    public void BuildCacheKeyForOrganizationUser_ReturnsExpectedKey(Guid orgId, Guid userId)
+    {
+        var expected = $"OrganizationUserUserDetails:{orgId:N}:{userId:N}";
+        var key = EventIntegrationsCacheConstants.BuildCacheKeyForOrganizationUser(orgId, userId);
+
+        Assert.Equal(expected, key);
+    }
+
+    [Fact]
+    public void CacheName_ReturnsExpected()
+    {
+        Assert.Equal("EventIntegrations", EventIntegrationsCacheConstants.CacheName);
+    }
+}