RFC: Use xfile.name instead of p.basename(file.path)

[Curvel]

Currently, if the metadata attribute filenameisn't set meta["filename"] = p.basename(file.path) is used defaulty.

This doesn't work with XFile in Flutter Web. Quote from the XFileBase class: Accessing the data contained in the picked file by its path is platform-dependant (and won't work on web). Therefore, I propose to use XFile.name instead.

It's not a big issue because one can simply use:

TusClient(
      endpoint,
      file,
      metadata: {
        "filename": file.name
      },
)

but it would be more intuitive when also building for web.

[jjmutumi]

Interesting point! I'll have look at implementing this. Also open to a pull request?