chore(clerk-js,clerk-react,types): Expose environment for better inter-package development

[tmilewski]

Description

We're utilizing __unstable__environment a bunch in elements and the current state doesn't enforce type safety and requires us to override types in our own package.

The better facilitate inter-package development, I've made the following changes to Clerk and IsomorphicClerk:

• __unstable__environment is now exposed, typed, marked as deprecated, and commented on about its internal state. (To be removed in a future release.)
• __internal_environment is exposed with the appropriate typing and comments about its internal state.

Notes:

• I left __unstable__environment for now, until it's worked out of both elements and the accounts repo.

Checklist

• [x] npm test runs as expected.
• [x] npm run build runs as expected.
• [ ] (If applicable) JSDoc comments have been added or updated for any package exports
• [ ] (If applicable) Documentation has been updated

Type of change

• [ ] 🐛 Bug fix
• [ ] 🌟 New feature
• [ ] 🔨 Breaking change
• [x] 📖 Refactoring / dependency upgrade / documentation
• [ ] other:

Packages affected

• [ ] @clerk/backend
• [ ] @clerk/chrome-extension
• [x] @clerk/clerk-js
• [ ] @clerk/clerk-expo
• [ ] @clerk/fastify
• [ ] gatsby-plugin-clerk
• [ ] @clerk/localizations
• [ ] @clerk/nextjs
• [x] @clerk/clerk-react
• [ ] @clerk/remix
• [ ] @clerk/clerk-sdk-node
• [ ] @clerk/shared
• [ ] @clerk/themes
• [x] @clerk/types
• [ ] build/tooling/chore