[FEA] Allow configuring a subset of nodes in a certain mode.

Hi, first of all I want to say this is a great project to manage lifecycle nodes!

There'a a need to config the lifecycle state of only a subset of nodes in one mode, but config another subset of nodes in other modes.

Let's say, can the following config work? (Currently I don't need the extra parameter-based modes either)

#### 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

```

EDIT, the step of reproduce has been updated @ralph-lange

#### step to reproduce

```sh
time ros2 service call /actuation/change_state lifecycle_msgs/ChangeState "{transition: {id: 1, label: configure}}"
time ros2 service call /actuation/change_state lifecycle_msgs/ChangeState "{transition: {id: 3, label: activate}}"
```

#### expected

the lefe manipulator should be in active

#### actual


Comece pela configuração YAML de system-modes na issue e reproduza o comportamento usando as duas chamadas de serviço do ros2 para /actuation/change_state. Rastreie como os mapeamentos parciais de modos são aplicados aos lifecycle nodes. Está concluído quando um modo puder configurar apenas o subconjunto de nós listado nele, preservando os estados apropriados dos outros nós, com o manipulador esquerdo alcançando o estado active no exemplo fornecido.

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