Function offer_vmbus_device_handle_unit

pub async fn offer_vmbus_device_handle_unit(
    driver_source: &VmTaskDriverSource,
    state_units: &StateUnits,
    vmbus: &VmbusServerHandle,
    resolver: &ResourceResolver,
    resource: Resource<VmbusDeviceHandleKind>,
) -> Result<SpawnedUnit<ChannelUnit<dyn VmbusDevice>>>

Offers a channel, creates a unit for it, and adds it to state_units.