build: switch to dual package emitting

[cf-remylenoir]

Purpose of PR

[!NOTE] This is only for v5 alpha/beta pre-releases and won't be merged into main

Adds setup for emitting 2 package.json files for ESM and CJS, making use of tsconfig-to-dual-package.

This approach has the benefit of clearly declaring what type should be used since it relies on 2 package.json and prevents Node/TypeScript configuration confusion or change for the consumers, and mostly issues with our direct dependency for the icons (Phosphor)

Motivation and readings 🍿

• https://github.com/microsoft/TypeScript/issues/49462
• https://github.com/microsoft/TypeScript/issues/54593

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Latest commit: 2701795ca73be4713788f9b05b5bfd9823cd3bd3

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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Name	Status	Preview	Updated (UTC)
forma-36	❌ Failed (Inspect)		May 8, 2024 2:54pm