Integrate with Google Cloud Functions about feral HOT 4 OPEN

I started working on this a bit and it seems that the background functions are (about to become) legacy, in favor of CloudEvents, which are supposedly designed to be cloud-platform-independent. It seems the Cloud Functions documentation hasn't been updated with this, and it's still not entirely clear to me how to deploy cloud-event-based functions.

In any case, it seems we may want to build our own Functions Framework according to the contract laid out here:
https://github.com/GoogleCloudPlatform/functions-framework#functions-framework-contract
IMO this is actually a lot more interesting, since it describes something lower-level (i.e., listening on ports rather than being handed pre-digested events) and actually might be portable beyond the Google Cloud Platform. So this gives us a lot more control over how we do things, and makes them much easier to test without requiring to emulate specific cloud environments.

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For performance, efficiency and correctness reasons, the framework must be able to handle multiple concurrent invocations of the developer's function.

This is very interesting 🤓

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Superseded by #132.

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Well, I suppose this is worth keeping open actually. At the moment I don't think you can deploy a custom Functions Framework to Cloud Functions (you have to buy into one of their frameworks) and Cloud Functions is a different product with a different pricing model etc. than e.g. Cloud Run or another service where you can deploy an custom Functions Framework.

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