feat: Add wasm module build

[timfish]

• Closes Potential JavaScript API #8

This PR is built on top of #10 and #11 so they would need to be merged first for the full diff here to be reduced.

You can see the diff from the previous PR here.

This PR:

• Adds a wasm feature so that consumers of the Rust library don't need to bring in all those dependencies if they don't need them
• Adds a transform function to InstrumentationVisitor - this was moved from the test utils with unwrap() removed
• Adds annotations to the config types which creates conversion code between rust<->javascript and typescript types
• Adds a wasm module in the library that is only enabled with the wasm feature
• In the wasm module, add functions and types that are exposed from wasm via #[wasm_bindgen]
• InstrumentationVisitor lifetimes had to be removed because they're not supported across rust<->js boundary
• Adds a package.json

You can npm install && npm run build to build the module.
You can run npm test to run a single JavaScript test of the wasm and asserts the output matches what's expected.

[cit-pr-commenter]

PR Security Update

All commits in this PR up to and including 19b4ae3 have been reviewed and marked safe by SDLC security. For any questions, please reach out to #ci-for-external-contributors-collab on Slack.

[timfish]

So I've split the additions into 2 features, serde and wasm. The wasm feature enables serde too.

If you don't enable any features you get the basic Rust library.
Enable the serde feature and you can serialise/deserialise the config types.
When building the npm module, the wasm feature is enabled.

[timfish]

Oh no, I deleted this branch forgetting this was still open here!