chore: Update JS packaging

[bgins]

Description

This PR implements the following changes:

• Update package exports for broader support across JS frameworks and environments
• Use playwright-test for node tests instead of vitest
• Unify node and browser tests into a single test suite
• Drop the deno target for now. Deno should be able to load the node target, but we can revisit in the future if not.

This PR brings in improvements we have been working on over in https://github.com/fission-codes/wasm-js.

We are testing node and a few frameworks over there, including SvelteKit, NextJS, and Preact.

Link to issue

No issue yet. Happy to open one if we want it.

Type of change

• Refactor (non-breaking change that updates existing functionality)

Test plan (required)

Run npm run test to test the included test. We may also want to test this with betterboxd to make sure it still works there.