TODO:

• adjust the SQL scripts (create and update) and add a column TENANT_ID_ on ACT_RU_EXECUTION table
• add a field tenantId on entity class
• set the tenant-id on the entity while starting a process instance / creating an execution
• inherit the tenant-id from the process definition
• add a method on the ProcessInstanceQuery and ExecutionQuery to filter by a tenant-id or a list of tenant-ids (tenant-id of the process instance / execution in ...)
• adjust the REST-API (dto for query request / response)