[Feature][process_definition] process definition need to support parallel or serial choose.

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process definition need to support parallel or serial choose.
if is serial in dispatch，need to the previous process_instance execute complete，next process_instance can to run。

流程实例中支持并发并行和串行。 如果是串行处理，需要等待上一个流程实例运行完成后，下一个流程实例才可以运行。
如果是并行处理，则不需要。

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I need to pull request. table t_ds_process_definition need to add field is_parallel

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I will pull request. table t_ds_process_definition need to add field is_parallel

[597365581]

process definition need to support parallel or serial choose.
if is serial in dispatch，need to the previous process_instance execute complete，next process_instance can to run。

流程实例中支持并发并行和串行。 如果是串行处理，需要等待上一个流程实例运行完成后，下一个流程实例才可以运行。
如果是并行处理，则不需要。

process definition need to support parallel or serial choose.
if is serial in dispatch，need to the previous process_instance execute complete，next process_instance can to run。

流程实例中支持并发并行和串行。 如果是串行处理，需要等待上一个流程实例运行完成后，下一个流程实例才可以运行。
如果是并行处理，则不需要。

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@break60 please help to confirm

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[Feature][process_definition] process definition need to support parallel or serial choose. and parallel mode support wait queue length #3728