Backend refacto - Githubissues

Roadmap

[x] Prepare Fastify 5 migration => https://github.com/Cinevoraces/cinevoraces/pull/171 Rework plugins that mixes async and callback styles as it will result in errors with Fastify 5.

Rework the structure of the controllers/services. No more "_" prefix ~~services shouldn't be classes as it's not the fastify convention~~.

[x] Create an HTTPClient class https://github.com/Cinevoraces/cinevoraces/pull/167

(Add it in the Server/utils folder and import it with the other external dependencies)
- Add the downloadFile() method to that class
[x] fs refacto https://github.com/Cinevoraces/cinevoraces/pull/167

The following functions should not be declared as fileService methods but should ~~be added to the FastifyInstance as an "fs" plugin~~ be declared in the utils folder.

:warning: ~~That plugin should be loaded first as it will be required by services~~
- saveFile()
- deleteFile()
[x] Cloudinary refacto

The following functions should not be declared as fileService methods but should be added to the FastifyInstance as a "Cloudinary" plugin. (Add it in the Server/utils folder and import it with the other external dependencies) be declared in the utils folder.
- UploadAvatar()
- This function should be a UserService function.
- Replace generateGuid() method calls with crypto's randomUUID()
```
import crypto from "crypto";

crypto.randomUUID();
```
- cloudinaryUpload()
- Errors should not be ignored
- cloudinaryDelete()
- Errors should not be ignored