Support WASM Api

[mssalemi]

Wasm API Support for function-runner

Closes: https://github.com/shop/issues-shopifyvm/issues/32

Function-runner now detects when a module is using the Wasm API by checking if it imports modules with names starting with shopify_function_v.

When a Wasm API function is detected:

1. The input is automatically transcoded from JSON to MessagePack
2. The Wasm API provider (shopify_function_v0.0.1.wasm) is loaded
3. The output is automatically transcoded from MessagePack back to JSON

For output handling:

1. Locates the actual MessagePack data in the output stream
2. Extracts only the relevant MessagePack portion for processing
3. Properly decodes it to JSON for the function result

🎩 Tophat

WASM API

cargo run -- -f tests/fixtures/build/echo.trampolined.wasm -i tests/fixtures/input/wasm_api_function_input.json 

JAVY_V2

cargo run -- -f tests/fixtures/build/js_function_javy_plugin_v2.wasm -i tests/fixtures/input/js_function_input.json -e run

Testing

• Added unit tests for Wasm API function execution
• Added integration tests for running Wasm API functions via CLI
• Tested with the example echo.trampolined.wasm function

note: todo - test everything else is still working as expected

[adampetro]

I wonder if it would make sense to create a Codec enum like:

enum Codec {
  Json,
  Msgpack,
}

and then select a codec based on conditions, then put all of the conditional codec logic into methods on Codec, such as:

impl Codec {
  fn transcode_from_json_bytes(&self, bytes: Vec<u8>) -> `anyhow::Result<Vec<u8>>` {
    match self {
      Self::Json => Ok(bytes),
      Self::Msgpack => {
        todo!()
      }
    }
  }
}

[saulecabrera]

@mssalemi could you hold on until #464 lands? In that PR I've fixed the codec handling across the entire codebase, which I think will make it easier to do the encoding inferencing introduced in this PR.

[saulecabrera]

Looking good, I think after the last two comments are resolved we can land this.

[saulecabrera]

Thanks for iterating on this. Approving from my end, I'll leave the final approval to @andrewhassan, given the latest comments.

[adampetro]

Let's squash the commits before merging

[adampetro]

And hold off on merging for the finalized initial version of the provider module