Add experimentScoreMiddleware() that adds step.score()

[jpwilliams]

Summary

Adds experimentalScoreMiddleware() which gives access to step.score(), allowing us to start testing scoring with experimentation dashboards.

import { experimentScoreMiddleware, Inngest } from "inngest";

const inngest = new Inngest({
  id: "test",
  middleware: [experimentScoreMiddleware()],
});

inngest.createFunction(
  { id: "test-fn", triggers: [{ event: "test/event" }] },
  async ({ step }) => {
    await step.score("accuracy", 0.9);

    await step.score("performance", async () => {
      // some expensive scoring logic

      return 52352;
    });
  },
);

Temporal scoring can be dogfooded using some grim code:

const scoreP = (async () => {
  const gotAThing = await step.waitForEvent();
  return step.score("got-it", Boolean(gotAThing)); 
})();

// ... rest of the fn ...

await scoreP;

Checklist

• Added a docs PR that references this PR N/A Experiment
• Added unit/integration tests N/A Experiment
• Added changesets if applicable

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4fdafe0

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[inngest-release-bot]

A user has added the prerelease/inngest label, so this PR will be published to npm with the tag pr-1451. It will be updated with the latest changes as you push commits to this PR.

You can install this prerelease version with:

npm install inngest@pr-1451

The last release was built and published from 4fdafe0.