Add support for type functions

[NotMirrox]

Description

Type functions (part of Luau's new beta type solver) are not currently supported by pesde. They should be handled like regular types during export and re-export.

Requested Feature

Add support for type functions so they can be:

• Exported from packages
• Re-exported when needed by dependent packages

Use Case

Packages using Luau's beta type solver with type functions need to expose these to downstream users, just like regular types.

[daimond113]

This will be fixed with pesde 0.8, which will switch to Luau aliases.