As a User I want to upload to configurable storage provider

[StanislawMazowieckiAriane]

This functionality is already implemented in Mintbox

Acceptance criteria:

• Supported providers should include:
  • NFTStorage
  • Pinata
  • AWS S3
  • Mock provider
• There should be documentation on how to implement a custom storage provider
• All providers should follow the same interface
• Provider selection should be made using enum as a parameter
• Support for both single-file and batch uploading should be implemented
• Support for both files and in-memory objects
• Support for all kinds of inputs, including byte arrays, input streams...
• The output of this function(s) should allow the user to clearly understand where each file is hosted. It should be compatible with "easy way to add key-value pair..."

To discuss:

• how should we return the result? Should it be always a file, always an array/object or should we have 2 separate functions to let the user choose what he wants? A: added to description
• how should the return structure look like? A: added to description
• Q: how do we want to configure and use the provider? A: create a Factory class that returns a configured provider after providing it required credentials

example return structure for a file:

{
  "content": "metadata/1.json",
  "URL": "https://dhdhsad.com/12332"
}

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example return structure for an in-memory object:

{
  "content": <content>,
  "URL": "https://dhdhsad.com/12332"
}

content can be any object, array, string etc.

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