Pretty printing logs

[caass]

Implement wrangler tail --pretty to output human-readable text instead of JSON. Here's a screenshot of it in use:

You can see the output from two different requests, as well as a cron trigger.

For reference, the code used in this worker is:

export default {
  fetch(request) {
    switch (request.method) {
      case "GET":
        console.log("get request received");
        break;
      case "POST":
        console.warn("POST request received");
        break;
      case "PUT":
        console.error("PUT request received");
        break;
      default:
        throw new Error(`Recieved ${request.method} request`);
    }

    console.log("sending response");
    return new Response(request.method);
  },
};

The cron errors because i added a trigger while testing cron messages and then removed the handler -- but it demonstrates how cron logs look!

[changeset-bot]

🦋 Changeset detected

Latest commit: 09d73b8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
wrangler	Patch

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[github-actions]

A wrangler prerelease is available for testing. You can install it in your project with:

npm install --save-dev https://prerelease-registry.developers.workers.dev/runs/1860779332/wrangler

Or you can try developing a worker directly with:

npx https://prerelease-registry.developers.workers.dev/runs/1860779332/wrangler dev path/to/script.js

[threepointone]

I paired with @caass on a review, and pointed out nits, looks good otherwise! Tentatively approving.