BUG: add function to check whether data is all scalar in pandas.array

Author: antareepsarkar

pandas/_libs/lib.pyx

@@ -862,10 +862,7 @@ cpdef ndarray[object] ensure_string_array(
     return result
 
 
-@cython.wraparound(False)
-@cython.boundscheck(False)
-cpdef bool is_all_scalar(obj: list | tuple):
-    # Optimized for lists and tuples
+def is_all_scalar(obj: list | tuple) -> bool:
     cdef:
         Py_ssize_t i, n = len(obj)
         bool all_scalars = True