Interop Gen: Support Globbed Export, Default Exports and Exporting Namespace Import Objects

[nikeokoronkwo]

This issue is for adding support for the following export features:

• Globbed exports (i.e. export * from "file.ts")
• Default exports (i.e. export default a or export = a (a more commonJS alternative)
• Exporting Namespace Import Objects: i.e.

  import * as a from "a.ts"
  
  export { a }

These export methods would require namespace handling, and so are paired together in this issue