feat(gatsby): create telemetry service and start it during develop

[mxstbr]

As we noticed in #26627, gatsby-telemetry can only run in a node context. In order to add telemetry to Admin we need to create a HTTP server that exposes the telemetry methods for Admin to POST to.

• Set up express server
• Expose basic setGatsbyCliVersion and setDefaultComponentId
• Expose all necessary methods that Admin needs

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[jamo]

🤩

[wardpeet]

Can we make this part of gatsby-admin and not part of telemetry?

Edit:
Sorry for the fast answer, I didn't want this merged before a discussion and I was heading into a meeting. Moving this to admin would make more sense cause it's the only user. This way we can keep telemetry small with fewer side effects.

Now that I think of it, telemetry itself should probably be a toolkit that allows us to track pieces but gatsby-cli/gatsby should do the setup/flushing, ...

Why did you add it to telemetry and not admin itself?

[mxstbr]

Can we make this part of gatsby-admin and not part of telemetry?
Why did you add it to telemetry and not admin itself?

I put it in gatsby-telemetry because there is nothing Admin-specific in that HTTP server. There will be Admin-specific bits, specifically starting this as a discoverable service for each site, however those will likely have to live in gatsby develop.

I'd be happy to physically move that file to gatsby-admin if you'd prefer that!

[wardpeet]

My mistake, please move it to gatsby-develop not gatsby-admin 👍. I just don't want it living in gatsby-telemetry.

[mxstbr]

Done! Ready for a re-review @wardpeet 👍

[wardpeet]

Seems to work :) Looking good