[FEA] Allow deactivating nodes when system is activated.

Ninguém assumiu esta issue ainda.

There is a need to selectively disable the function of a node, that's say deactivating a node in a certain system mode.

Should the following config work? Thanks!

#### SHM file

```yaml
---
# system modes example
---

actuation:
ros__parameters:
type: system
parts:
drive_base
left/manipulator
right/manipulator
modes:
__DEFAULT__:
drive_base: active.__DEFAULT__
left/manipulator: inactive.__DEFAULT__
right/manipulator: inactive.__DEFAULT__
LEFT:
# drive_base: active.__DEFAULT__
left/manipulator: active.__DEFAULT__
right/manipulsator: inactive.__DEFAULT__
RIGHT:
# drive_base: active.__DEFAULT__
left/manipulator: inactive.__DEFAULT__
right/manipulator: active.__DEFAULT__

left/manipulator:
ros__parameters:
type: node
modes:
__DEFAULT__:
ros__parameters:
max_torque: 0.1

drive_base:
ros__parameters:
type: node
modes:
__DEFAULT__:
ros__parameters:
max_speed: 0.1
controller: PID

right/manipulator:
ros__parameters:
type: node
modes:
__DEFAULT__:
ros__parameters:
max_torque: 0.11

```

#### step to reproduce

```sh
zs@zs-vm-2204:~/zs_ws/ga_ros$ ros2 service call /actuation/change_state lifecycle_msgs/ChangeState "{transition: {id: 1, label: configure}}"
waiting for service to become available...
requester: making request: lifecycle_msgs.srv.ChangeState_Request(transition=lifecycle_msgs.msg.Transition(id=1, label='configure'))

response:
lifecycle_msgs.srv.ChangeState_Response(success=True)
```

after this ,all nodes become OK

```sh
zs@zs-vm-2204:~/zs_ws/ga_ros$ ros2 service call /actuation/change_state lifecycle_msgs/ChangeState "{transition: {id: 3, label: activate}}"
requester: making request: lifecycle_msgs.srv.ChangeState_Request(transition=lifecycle_msgs.msg.Transition(id=3, label='activate'))

response:
lifecycle_msgs.srv.ChangeState_Response(success=True)
```

after this , every thing OK

```sh
zs@zs-vm-2204:~/zs_ws/ga_ros$ time ros2 service call /actuation/change_mode system_modes_msgs/ChangeMode "{mode_name: 'LEFT'}"
waiting for service to become available...
requester: making request: system_modes_msgs.srv.ChangeMode_Request(mode_name='LEFT')

```

after this, the mode_manager died with a segfault.


EDIT: @ralph-lange

the step of reproduce is updated in 2022-11-12.

Comece pela configuração YAML do SHM e reproduza o problema usando as chamadas de serviço Lifecycle e /actuation/change_mode listadas. Inspecione o comportamento de mode_manager ao alternar para LEFT, especialmente as entradas de desativação dos nós; considera-se concluído quando a mudança de modo é concluída sem um segfault e os nós selecionados estão inativos conforme configurado.

Escrita pelo modelo de indexação a partir do texto da issue.