[BUG] support index functions in cudf.DataFrame.rename

**Is your feature request related to a problem? Please describe.**
rewriting code with `import cudf as pd`

**Describe the solution you'd like**
```
>>> import cudf as pd
>>> pd.__version__
'22.12.01'
>>> df = pd.DataFrame({'a': range(10)})
>>> df = df.rename(index=str, columns={'a': 'b'})
Traceback (most recent call last):
File "", line 1, in
File ".../python3.8/contextlib.py", line 75, in inner
return func(*args, **kwds)
File ".../python3.8/site-packages/cudf/core/dataframe.py", line 3365, in rename
any(type(item) == str for item in index.values())
AttributeError: type object 'str' has no attribute 'values'
```