Remove unused imports and make exports explicit

This allows Pyright to actually catch these errors, which would be
useful for CI purposes in the future.

Author: Rapptz

Diff for: discord/__init__.py

@@ -43,7 +43,13 @@
 from .widget import *
 from .object import *
 from .reaction import *
-from . import utils, opus, abc, ui, app_commands
+from . import (
+    utils as utils,
+    opus as opus,
+    abc as abc,
+    ui as ui,
+    app_commands as app_commands,
+)
 from .enums import *
 from .embeds import *
 from .mentions import *

Diff for: discord/threads.py

@@ -26,8 +26,6 @@
 
 from typing import Callable, Dict, Iterable, List, Optional, Union, TYPE_CHECKING
 from datetime import datetime
-import time
-import asyncio
 
 from .mixins import Hashable
 from .abc import Messageable, _purge_helper

Diff for: pyproject.toml

@@ -42,6 +42,7 @@ exclude = [
     "docs",
 ]
 reportUnnecessaryTypeIgnoreComment = "warning"
+reportUnusedImport = "error"
 pythonVersion = "3.8"
 typeCheckingMode = "basic"