[utils] `classproperty`: Add cache support

yt_dlp/utils.py

@@ -5847,14 +5847,23 @@ def cached_method(f):
 
 
 class classproperty:
-    """property access for class methods"""
+    """property access for class methods with optional caching"""
+    def __new__(cls, func=None, *args, **kwargs):
+        if not func:
+            return functools.partial(cls, *args, **kwargs)
+        return super().__new__(cls)
 
-    def __init__(self, func):
+    def __init__(self, func, *, cache=False):
         functools.update_wrapper(self, func)
         self.func = func
+        self._cache = {} if cache else None
 
     def __get__(self, _, cls):
+        if self._cache is None:
             return self.func(cls)
+        elif cls not in self._cache:
+            self._cache[cls] = self.func(cls)
+        return self._cache[cls]
 
 
 class Namespace(types.SimpleNamespace):