Update to fastly:compute/service@0.1.0.

[dgohman-fastly]

No description provided.

[posborne]

Long term we'll need to figure out how we want to pull in WIT but copying for now is fine. Other options might be:

• Copy but use the single-file output from wasm-tools wit; we transform to this in build.rs anyhow.
• Git submodule; probably the best option if we end up making https://github.com/fastly/fst-compute-wit public (under some name). We could move to that now but it might just make more work in making this public in the near term.
• Viceroy git submodule? Don't love this but it would be another option.
• Pull in data as rust crate dep to get the data.

Gitsm is probably where we'll end up I'm guessing. The final option could make sense at some point as an alternate distribution option but is probably unnecessary unless we end up having a similar build-tool-written-in-rust pattern pop up elsewhere (which, it definitely could in the future).

EDIT: But even with that tooling, we currently call out to componentize-py to generate stubs anyhow so it wouldn't even be a complete solution (without expanding our tooling).

[dgohman-fastly]

I'm also expecting we'll eventually have a dedicated public git repo we can pull in as a submodule for the WIT interfaces. Until then, the interfaces is now stable so hopefully we won't be doing this copying very often.