refactor(tools): prepare for migration from Requests to httpx

This commit prepares for migrating from Requests to httpx by adjusting imports and usage in LDAP, command line tools, and GUI code.

antarest/gui.py

@@ -6,7 +6,13 @@
 from multiprocessing import Process
 from pathlib import Path
 
-import requests
+try:
+    # `httpx` is a modern alternative to the `requests` library
+    import httpx as requests
+except ImportError:
+    # noinspection PyUnresolvedReferences, PyPackageRequirements
+    import requests
+
 import uvicorn  # type: ignore
 from PyQt5.QtGui import QIcon
 from PyQt5.QtWidgets import QAction, QApplication, QMenu, QSystemTrayIcon

antarest/login/ldap.py

@@ -2,7 +2,12 @@
 from dataclasses import dataclass
 from typing import Dict, List, Optional
 
-import requests
+try:
+    # `httpx` is a modern alternative to the `requests` library
+    import httpx as requests
+except ImportError:
+    # noinspection PyUnresolvedReferences, PyPackageRequirements
+    import requests
 
 from antarest.core.config import Config
 from antarest.core.model import JSON

antarest/tools/lib.py

@@ -8,8 +8,17 @@
 from zipfile import ZipFile
 
 import numpy as np
-import requests
-from requests import Session
+
+try:
+    # The HTTPX equivalent of `requests.Session` is `httpx.Client`.
+    import httpx as requests
+    from httpx import Client as Session
+except ImportError:
+    # noinspection PyUnresolvedReferences, PyPackageRequirements
+    import requests
+
+    # noinspection PyUnresolvedReferences,PyPackageRequirements
+    from requests import Session
 
 from antarest.core.cache.business.local_chache import LocalCache
 from antarest.core.config import CacheConfig
@@ -48,7 +57,7 @@ def __init__(
         session: Optional[Session] = None,
     ):
         self.study_id = study_id
-        self.session = session or requests.session()
+        self.session = session or Session()
         # TODO fix this
         self.session.verify = False
         self.host = host