Cleanup of sub device manager state inside device to simplify porting to meshdevice

[tt-aho]

    std::unordered_map<SubDeviceManagerId, std::unique_ptr<detail::SubDeviceManager>> sub_device_managers_;
    SubDeviceManagerId active_sub_device_manager_id_ = {0};
    detail::SubDeviceManager *active_sub_device_manager_ = nullptr;
    SubDeviceManagerId next_sub_device_manager_id_ = {0};
    SubDeviceManagerId default_sub_device_manager_id_ = {0};
    detail::SubDeviceManager *default_sub_device_manager_ = nullptr;

Currently, the single device object manages a number of different attributes regarding what the configured manager is, and if we want to uplift the SubDeviceManager concept to the mesh device level, this would require MeshDevice to copy/implement all of this logic as well, even though the logic would basically be duplicated.

The current thought/plan is to hoist all of this into an owning object that manages all of this, and then device/mesh device just needs instantiate this single owning object that they can query to get ex the active/default managers.

Ex. Change the existing SubDeviceManager to be SubDeviceConfiguration, and have the new owning object be the SubDeviceManager (final naming tbd)

Device {
    unique_ptr<SubDeviceManager> sub_device_manager_;
}

SubDeviceManager {
    std::unordered_map<SubDeviceConfigurationId, std::unique_ptr<detail::SubDeviceConfiguration>> sub_device_configurations_;
    SubDeviceConfigurationId active_sub_device_configuration_id_ = {0};
    detail:: SubDeviceConfigurationId *active_sub_device_configuration_ = nullptr;
    SubDeviceConfigurationId next_sub_device_configuration_id_ = {0};
    SubDeviceConfigurationId default_sub_device_configuration_id_ = {0};
    detail:: SubDeviceConfigurationId *default_sub_device_configuration_ = nullptr;
}

[tt-aho]

@cfjchu fyi