Get Sandbox Container Events in the SDK

[cooper-grc]

Summary by cubic

Add sandbox container lifecycle events to the API and Python SDK so clients can fetch recent events for a sandbox with pagination. OpenAPI/gRPC gateway are updated, and monitoring now also scrapes port 8112.

• New Features
  • API: GET /pods/{stub_id}/events (PodService_SandboxListEvents) adds paginated event listing via optional searchAfter; returns events (id, time, type, status, containerId, workerId, stubId, exitCode) and nextCursor, sorted newest first, with workspace ownership checks; backed by Elasticsearch. OpenAPI and gateway code generated accordingly.
  • Python SDK: added SandboxInstance.list_events(cursor=None) and AsyncSandboxInstance.list_events(cursor=None) returning (List[SandboxEvent], next_cursor); raises SandboxConnectionError on failure.

^{Written for commit e6d623a. Summary will update on new commits.}