refactor: download manifest endpoint and integrate fastify
Much simpler API for fetching a package
```
const manifest = await storage.getPackageNext({
name,
uplinksLook: true,
req,
version: queryVersion,
requestOptions,
});
```
> not perfect, the `req` still is being passed to the proxy (this has to be refactored at proxy package) and then removed from here, in proxy we pass the request instance to the `request` library.
### Details
-`async/await` sugar for getPackage()
- Improve and reuse code between current implementation and new fastify endpoint (add scaffolding for request manifest)
- Improve performance
- Add new tests
### Breaking changes
All storage plugins will stop to work since the storage uses `getPackageNext` method which is Promise based, I won't replace this now because will force me to update all plugins, I'll follow up in another PR. Currently will throw http 500
