[feature] Add the ability to read ziped ntfs

[antoine-de]

change the transit_model::ntfs::read method to be able to read a zip archive

like the gtfs module, the ntfs module now have:

let model = transit_model::ntfs::read("path_to_a_ntfs_directory_or_a_zip_archive")?; // <- main method, black magic to detect zip or not

let model = transit_model::ntfs::read_from_path("path_to_a_ntfs_directory")?;

let model = transit_model::ntfs::read_from_zip("path_to_a_zip")?;

It also brings a lower level from_read method if one day we want more flexible reading options like:

let url = "http://some_url/ntfs.zip";
let resp = reqwest::blocking::get(url)?; // or async call
let data = std::io::Cursor::new(resp.bytes()?.to_vec());
let model = transit_model::ntfs::from_read(data, &url)?;

The global behavior can be check in the test file tests/read_ntfs.rs.

Note: from method visibility have been changed from pub to pub(crate) to not expose the FileHandler, so this is a breaking change. However I don't think those methods were used in practice. At least not internally by Kisio.

[woshilapin]

Instead of doing pub(crate) everywhere and having the risk to expose stuff we do not want... maybe it's time to remove the pub mod ntfs; in src/lib.rs and only expose the methods that intended to be exposed, what do you think?

[antoine-de]

hum I think we want a pub mod here, we want to be able to do transit_model::ntfs::read no?