Fix: Smart-plugin not supporting an off-drive path

[radinparhami]

Checklist

• I am sure the error is coming from Pyrogram's code and not elsewhere
• I have searched in the issue tracker for similar bug reports, including closed ones
• I ran pip3 install -U https://github.com/pyrogram/pyrogram/archive/master.zip and reproduced the issue using the latest development version

Description

I am developing a Telegram bot as a Python library that uses Pyrogram.
And I use Smart Plugin, when I want to set the root path, because the user file does not match the library path, I have to give the library path like this:

dict(root=os.path.dirname(plugins.__file__))

When I change the following code in the pyrogram client file, it works:

for path in sorted(Path(root.replace(".", "/")).rglob("*.py")):
    parts = path.parent.parts
    if "site-packages" in parts:
        module_path = '.'.join(parts[parts.index("site-packages") + 1:])
    else:
        module_path = '.'.join(parts + (path.stem,))[4:]
    module = import_module(module_path)

Steps to reproduce

1. I want to set the plugin root path of a python library
2. but i can't ! 😓

Code example

from pyrogram import Client
from os import path

from proself import plugins

Client(..., plugins=dict(root=path.dirname(plugins.__file__))

Logs

File "P:\Python\venv\Lib\site-packages\pyrogram\client.py", line 690, in load_plugins
    module = import_module(module_path)

ModuleNotFoundError: No module named 'Python'

# PluginRootPath = "[my_drive_name]:\Python\venv\Lib\site-packages\proself\plugins"