openworkflow@0.8.0

• Add child workflow support with step.runWorkflow (#342, #349)
• Add auto-indexing for duplicate step names (#344)
• Various backend query improvements
• Enforce a hard cap of 1000 step attempts per workflow run (#343)
• Park workflow runs in running instead of legacy sleeping status (#347)
• Fix invoke race handling for parked parent workflows and parent wakeups
• Fix replay and parallel execution edge cases around retries and parked waits
• Fix stale-write and worker-claim race conditions in workflow run transitions
• Fix deadline-exceeded retry computation and workflow completion timeout logic