Actions will now:
- receive the complete input
- get the step they want to execute by themself
- check that the type is the right one
- resolve variables
These all share a common executor interface.
It will allow for actions with a special execution process (forms, loop,
router) to have all required informations.
Main workflow executor should:
- find the right executor to call for current step
- store the output and context from step execution
- call next step index
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