feat: PoC of generating Go bindings for augurs' outlier detection using Gravity

[sd2k]

This is a proof of concept of using gravity to generate Go bindings
for augurs' outlier detection functionality. There are two stages:

1. Build a Wasm component which wraps augurs-outlier in a simple
   interface that accepts and returns a string (since that is all
   Gravity supports right now).
2. Generate Go bindings from the Wasm component using gravity.

This results in a Go package that can be used to detect outliers using
the augurs code.

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch outlier-components-for-go-using-gravity

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[sd2k]

Superseded by #367