Provide lifecycle servicing

还没有人认领这个 Issue。

The mode manager usually knows the **target** state/mode and the **current** state/mode (via mode_inference) of a system or node. Currently we assume, that there is a trivial transition to the target state, e.g, _activate_ to go to active, _deactivate_ to go to inactive.

However, this is not always true, e.g., if actual state is already the target state, or if target state can only be reached with >1 transitions. In order to allow that, mode manager needs to implement some kind of lifecycle service that knows how to get a node from any state to any other.

首先定位 mode manager 及其 mode_inference 集成，然后追踪目标状态和当前状态如何用于转换。围绕所要求的行为定义生命周期服务：它应处理已经到达的目标，以及需要在任意状态之间进行多次转换的目标。

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