Handle exporting types when `--isolatedModules` is on

[IgnusG]

Describe the bug
When the isolatedModules option is on re-exporting types has to be done using export type ... from ... otherwise typescript throws an error.

To Reproduce
Steps to reproduce the behavior:

1. Set compilerOptions.isolatedModules to true in tsconfig
2. Run Action to write index.ts
3. Exports are generated with a typescript error

Expected behavior
Types are exported using a separate export type statement along with the regular export

Screenshots

[mscolnick]

There is another useful extension I run right after the code generation https://github.com/mscolnick/vscode-type-only-imports, to convert the type-only import/exports to export type. It's been fine with the extra keystrokes and keeps the plugins isolated and not too bloated.

However, if you'd like to add the support directly in this extension, i'd be happy to take a contribution.