Build LlamaHub Integration

[TuanaCelik]

LlamaHub has added a function to convert outputs to haystack format, which luckily, seems compatible with 2.0 although it was built for 1.x.

The 'verified' data loaders have a standardized way to be loaded and used. Let's create an integration that consists of a custom component where the run function takes only a few things, such as: the name of the loader for download_loader('name of loader'), and the input expected for load_data()