Export all types

[Alex McGovern]

Describe the feature / bug 📝:

As not all types are exported, in some scenarios, types can't be named, e.g. when re-exporting Sonner as part of a library.

My specific issue arose when using Parcel to output .d.ts type definitions.

This has been reported before in this issue #399

And a fix was attempted in this PR, #400

I'm happy to attempt a fix for this when I have some time. ✌️❤️

Steps to reproduce the bug 🔁:

1. Bundle Sonner with another library and try to output .d.ts files, e.g.:
   a. Using parcel
   b. Using emit declaration with Typescript compiler

Examples of error output from Parcel:

🚨 Build failed.

@parcel/transformer-typescript-types: Exported variable 'toast' has or
is using name 'Action' from external module
"/Users/{USER}/src/{PACKAGE}/node_modules/sonner/dist/index"
 but cannot be named.

  /Users/{USER}/src/{PACKAGE}/src/toaster/index.tsx:14:14
    13 |  */
  > 14 | export const toast = sonnerToast;
  >    |              ^^^^^ Exported variable 'toast' has or is using name 'Action' from external module "/Users/{USER}/src/{PACKAGE}/node\_modules/sonner/dist/index" but cannot be named.
    15 |
    16 | /**

@parcel/transformer-typescript-types: Exported variable 'toast' has or
is using name 'ToastClassnames' from external module
"/Users/{USER}/src/{PACKAGE}/node_modules/sonner/dist/index"
 but cannot be named.

  /Users/{USER}/src/{PACKAGE}/src/toaster/index.tsx:14:14
    13 |  */
  > 14 | export const toast = sonnerToast;
  >    |              ^^^^^ Exported variable 'toast' has or is using name 'ToastClassnames' from external module "/Users/{USER}/src/{PACKAGE}/node\_modules/sonner/dist/index" but cannot be named.
    15 |
    16 | /**

@parcel/transformer-typescript-types: Exported variable 'toast' has or
is using name 'ToastToDismiss' from external module
"/Users/{USER}/src/{PACKAGE}/node_modules/sonner/dist/index"
 but cannot be named.

  /Users/{USER}/src/{PACKAGE}/src/toaster/index.tsx:14:14
    13 |  */
  > 14 | export const toast = sonnerToast;
  >    |              ^^^^^ Exported variable 'toast' has or is using name 'ToastToDismiss' from external module "/Users/{USER}/src/{PACKAGE}/node\_modules/sonner/dist/index" but cannot be named.
    15 |
    16 | /**