Bluetooth: Mesh: Add missing CBs for cfg_cli msg

Adds callback API for the following config client status messages:
- Composition data status
- Model publication status
- SIG model subscription list
- Vendor model subscription list
- Netkey list
- Appkey list
- SIG model app list
- Vendor model app list
- Key refresh status
- Heartbeat publication status
- Heartbeat subscription status

Signed-off-by: Anders Storrø <anders.storro@nordicsemi.no>