feat(CRater): Ping endpoint

[Aaron-Detre]

Changes

• When you enter a step with a Dialog Guidance or CRater Open Response component, PingEndpointService collects the item IDs.
• When the student focuses on the textbox, the client sends ping requests for all collected item IDs to the API.
• Pings will be sent every 4 minutes and 55 seconds regardless of whether or not they are still focusing on the textbox or not.
  • For simplicity + edge case where student types out response > unfocuses > model sleeps > refocuses > sends immediately
• When the student leaves the step, the item IDs are cleared out and pings are no longer sent.

Test

• Make sure that ~30 seconds after focusing on a "berkeley_" item ID that hasn't been used recently, scoring requests come back quickly without the cold start waiting time.
• Requires this PR for the API.

Closes #2159

[hirokiterashima]

LGTM

[hirokiterashima]

🎉 This PR is included in version 5.188.0 🎉

The release is available on GitHub release

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