Exported types for https://github.com/protectwise/troika.

Usage:
Add the following to your `tsconfig.json` to take advantage of types for troika-three-text:
```
{
  "compilerOptions": {
    "paths": {
      "troika-three-text": [
        "./node_modules/troika-types/packages/troika-three-text/dist/src/index"
      ]
    }
  }
}
```