Deploy workflow with sequential multi-instance service task / sub-process

[saig0]

Is your feature request related to a problem? Please describe.
I want to use sequential multi-instance on a service task and sub-process to execute it for each element of a collection - one-by-one.

Describe the solution you'd like

• I can mark a service task / sub-process with the multi-instance marker and isSequential=true
• when one instance of the service task / sub-process is completed, it creates the next instance for the collection
• when the last instance is completed, the service task / sub-process is left

Same as #2845 and #2846 but sequential instead of parallel.

Additional context

The BPMN XML could look like:

    <bpmn:task id="Task_1f0s1iu" name="task">
      <bpmn:multiInstanceLoopCharacteristics 
        isSequential="true"
        zeebe:collection="items" 
        zeebe:elementVariable="item" />
    </bpmn:task>

requires #2845
requires #2846