session: turn session module into a sub-package

- Create `streamlink.session` sub-package and move `session` module
  - Update/fix logger name
- Create `tests.session` sub-package and move `test_session` module
  - Fix monkeypatch paths
- Run session tests with a higher priority

src/streamlink/session/__init__.py

@@ -0,0 +1 @@
+from streamlink.session.session import Streamlink

src/streamlink/session/session.py

@@ -21,7 +21,7 @@ from streamlink.utils.url import update_scheme
 
 # Ensure that the Logger class returned is Streamslink's for using the API (for backwards compatibility)
 logging.setLoggerClass(StreamlinkLogger)
-log = logging.getLogger(__name__)
+log = logging.getLogger(".".join(__name__.split(".")[:-1]))
 
 
 _original_allowed_gai_family = urllib3_util_connection.allowed_gai_family  # type: ignore[attr-defined]

tests/conftest.py

@@ -18,6 +18,7 @@ _TEST_PRIORITIES = (
     "build_backend/",
     "tests/testutils/",
     "tests/utils/",
+    "tests/session/",
     None,
     "tests/stream/",
     "tests/test_plugins.py",

tests/session/test_session.py

@@ -102,8 +102,8 @@ class TestLoadPlugins:
         raises: nullcontext,
         logs: list,
     ):
-        monkeypatch.setattr("streamlink.session.Streamlink.load_builtin_plugins", Mock())
-        monkeypatch.setattr("streamlink.session.exec_module", Mock(side_effect=side_effect))
+        monkeypatch.setattr("streamlink.session.session.Streamlink.load_builtin_plugins", Mock())
+        monkeypatch.setattr("streamlink.session.session.exec_module", Mock(side_effect=side_effect))
         session = Streamlink()
         with raises:
             session.load_plugins(str(PATH_TESTPLUGINS))
@@ -349,7 +349,7 @@ class TestOptionsInterface:
             scheme: Mock(poolmanager=Mock(connection_pool_kw={}))
             for scheme in ("http://", "https://", "foo://")
         }
-        monkeypatch.setattr("streamlink.session.HTTPSession", Mock(return_value=Mock(adapters=adapters)))
+        monkeypatch.setattr("streamlink.session.session.HTTPSession", Mock(return_value=Mock(adapters=adapters)))
 
         return adapters
 
@@ -374,7 +374,7 @@ class TestOptionsInterface:
 
 def test_options_ipv4_ipv6(monkeypatch: pytest.MonkeyPatch, session: Streamlink):
     mock_urllib3_util_connection = Mock(allowed_gai_family=_original_allowed_gai_family)
-    monkeypatch.setattr("streamlink.session.urllib3_util_connection", mock_urllib3_util_connection)
+    monkeypatch.setattr("streamlink.session.session.urllib3_util_connection", mock_urllib3_util_connection)
 
     assert session.get_option("ipv4") is False
     assert session.get_option("ipv6") is False