Review [PyFilesystem](https://github.com/PyFilesystem) ecosystem

[rofinn]

FilePaths.jl was written to merge concepts from Python's pathlib and Julia's existing filesystem API. It would probably help to review the new PyFilesystem ecosystem to inspire future development. In particular, they appear to support many of the filesystem types we'd want to implement or cleanup (e.g., FTP, S3, Memory, Tar).

[rofinn]

After reviewing PyFilesystem my 2 main questions are:

1. How should we handle connections (e.g., FTPClient connections)?
2. Should we support a Restricted{<:AbstractPath} <: AbstractPath type which is similar to the sandboxing approach used in the python package?

[rofinn]

I think keeping connection / configs as an independent field of the path type is the simplest solution going forward see AWSS3.S3Path as an example. I'll open a separate issue/MR for making a sandboxed path type.