[Feature]: Support */runs/{run_id}/stream and */runs/{run_id}/wait

[aduminuc]

Problem Statement

Support the new endpoints specified here agntcy/acp-spec#40 in Workflow server

Proposed Solution

Add the above endpoints in the Agent Workflow Server APIs and handles

Alternatives Considered

No response

Additional Context

No response

Checklist

• I have read the contributing guidelines
• I have verified this does not duplicate an existing feature request