[Feature][api] need a api to create a process instance by defined id, and return the process instance id

[rockxsj]

Describe the feature
In other system, we want't to create a process definition by api call, and then create a process instance of this defined process, after that, we will query the process instance execute result.
Now the DS create the process instance at master server, and we have no any way to get the process instance after we create it, so we have no way to query the execute result.

Is your feature request related to a problem? Please describe.
Now the DS create the process instance at master server, and we have no any way to get the process instance after we create it, so we have no way to query the execute result.

Describe the solution you'd like
A sync call for create a process instance, and return the id to the caller.

Describe alternatives you've considered
None.

Additional context
None.