Adding CPUCore interface support

This commit introduces essential D-Bus infrastructure support for
hosting the `Item.CPUCore` D-Bus object. Additionally, it includes
getter and setter functions to enable get/set properties within the
`CPUCore` interface, such as core count and microcode.

Testing:
Unit test passed

Change-Id: I728522b34e96ee7d6609efb5746b40cf923812e8
Signed-off-by: Kamalkumar Patel <kamalkumar.patel@ibm.com>
diff --git a/host-bmc/test/meson.build b/host-bmc/test/meson.build
index d102ff7..f994552 100644
--- a/host-bmc/test/meson.build
+++ b/host-bmc/test/meson.build
@@ -6,6 +6,7 @@
   '../../common/utils.cpp',
   '../utils.cpp',
   '../dbus/custom_dbus.cpp',
+  '../dbus/cpu_core.cpp',
 ]
 
 tests = [