Allow imports of top level PyQt modules to work from the qt virtual module

This is needed for legacy compat of

from PyQt5 import QtCore, QtGui, etc

src/qt/__init__.py

@@ -0,0 +1,10 @@
+# autogenerated by __main__.py do not edit
+top_level_module_names=('QtCore', 'QtGui', 'QtWidgets', 'QtNetwork', 'QtSvg', 'QtPrintSupport', 'QtWebEngineCore', 'QtWebEngineWidgets')
+
+def __getattr__(name):
+    if name in top_level_module_names:
+        import importlib
+        return importlib.import_module("PyQt6." + name)
+    raise AttributeError(name)
+
+

src/qt/__main__.py

@@ -53,5 +53,18 @@ def scan(name):
         print(')', file=f)
 
 
+top_level_module_names = ()
 for name in ('core', 'webengine'):
+    top_level_module_names += module_lists[name]
     scan(name)
+with open(f'{base}/__init__.py', 'w') as f:
+    print('# autogenerated by __main__.py do not edit', file=f)
+    print(f'{top_level_module_names=}', file=f)
+    print(f'''
+def __getattr__(name):
+    if name in top_level_module_names:
+        import importlib
+        return importlib.import_module("{QT_WRAPPER}." + name)
+    raise AttributeError(name)
+
+''', file=f)