project: split the module into package layout

Author: isidentical

setup.cfg

@@ -10,7 +10,7 @@ long_description_content_type = text/markdown
 install_requires =
     fsspec==2021.05.0
     asyncssh==2.6.0
-py_modules = sshfs
+packages = find:
 
 [options.extras_require]
 bcrypt = asyncssh[bcrypt]