[WIP] Feature/x s3 bundle/256 uploads bundle abstractisation

[y-moufakkr]

closes #256

• Abstract the file storage
• Leave S3 and Local as two valid options
• Create the possibility of using any storage
• Leave the possibility of having multiple storages
• docs
• Create the posibility of having different contexts, like 3 s3 storages, 1 azure, and 2 local.
• unit tests
• rename the bundle in code and in docs

[theodorDiaconu]

@y-moufakkr can you resolve the conflicts. is this PR ready?

[y-moufakkr]

@theodorDiaconu do we need to create another bundle for this ? and keep x-s3-bundle as it is just like xpassword and xauth ?

[theodorDiaconu]

It's crucial that we have more contexts for upload. We should have a 'default' one and other named ones. Most of the times apps will use just one so a method like getUploader(name = "default") {} and returns an UploaderInterface