refactor(rpc): remove unused rpc_public and register_rpc_methods decorators

bec_widgets/utils/rpc_decorator.py

@@ -1,20 +1,3 @@
-def rpc_public(func):
-    func.rpc_public = True  # Mark the function for later processing by the class decorator
-    return func
-
-
-def register_rpc_methods(cls):
-    """
-    Class decorator to scan for rpc_public methods and add them to USER_ACCESS.
-    """
-    if not hasattr(cls, "USER_ACCESS"):
-        cls.USER_ACCESS = set()
-    for name, method in cls.__dict__.items():
-        if getattr(method, "rpc_public", False):
-            cls.USER_ACCESS.add(name)
-    return cls
-
-
 def rpc_timeout(timeout: float | None):
     """
     Decorator to set a timeout for RPC methods.