FEATURE: CommandHooks should be able to create additional commands

[mficzel]

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Description

CommandHooks are the way to process and modify incoming commands. However since they always return a single command a CommandHook cannot add additional commands to the chain.

Possible use cases:

• A CreateNodeVariant command is processed and the node properties are translated. This would require adding an additional SetNodeProperties Command
• A SetNodeProperties command is performed and a second SetNodeProperties command is created that translates the modified properties to other dimensions.

Possible Solution

A possible solution would be an onAfterHandle(): void method in the commandHookInterface. This method can be used to raise additional commands.

Alternatively the onBeforeHandle method could allow returning CommandInterface | Commands but that would come with quite some complexity as currently the results of each hook are passed to the next one.