Uploader params are not exposed outside the package

## Bug report for Cloudinary Dart SDK
Before proceeding, please update to latest version and test if the issue persists

## Params are not exposed outside the package
…

## Issue Type (Can be multiple)
[ ] Build - Can’t install or import the SDK
[ ] Performance - Performance issues
[ ] Behaviour - Functions aren’t working as expected (Such as generate URL)
[ ] Documentation - Inconsistency between the docs and behaviour
[x] Other (Specify)

## Steps to reproduce
```
final response = await _cloudinary.uploader().destroy(
DestroyParams(),
);
```

## Error screenshots or Stack Trace (if applicable)
…

## Build/Dependency management
[ ] Pubspec.yaml
[x] Other (Specify)

## Is the issue reproducible only on a specific device?
[x] No
[ ] Yes (specify device model + iOS/Android version)

## Versions and Libraries (fill in the version numbers)
cloudinary_api: ^1.1.1
cloudinary_url_gen: ^1.8.0

OS (on the dev environment) - 0.0.0
IDE/Android Studio - 0.0.0

Repository
If possible, please provide a link to a reproducible repository that showcases the problem