feat: improve the playground of the website

[jordimarimon]

Prerequisites

• I have read the Contributing Guidelines.
• I have searched for existing issues that already report this problem, without success.

Describe the Feature Request

It would be nice to offer a way to write multiple files in the playground and link them together so one can test how imports and reexports look like.

Probably add one tab per file on top of the editor.

The goal should be to offer a similar experience to what the TypeScript playground offers. The first logical step would be to switch and start using the Monaco editor.

Describe the Use Case

Right now the playground is very limited and it's not possible to see how imports get reflected.

Describe Preferred Solution

No response

Describe Alternatives

No response

Related Code

No response

Additional Information

No response