Move binop methods from Frame to IndexedFrame and standardize the doc…

…string (#10576)

This PR moves all the binary operation methods such as `Frame.add` into `IndexedFrame`. This removes these methods from `Index` objects to match pandas, where Index objects do not have these methods. I have also consolidated the docstrings for these methods using a single template and our `docutils`.

Note that this is technically a breaking change that I am implementing without a deprecation cycle; however, I feel comfortable doing so because these methods were introduced incidentally in #9357 and #9542 into 21.12, so just a couple of releases ago, and since they are not pandas APIs I doubt that they have made significant penetration into user workflows.

Authors:
  - Vyas Ramasubramani (https://github.com/vyasr)

Approvers:
  - GALI PREM SAGAR (https://github.com/galipremsagar)

URL: #10576

python/cudf/cudf/core/dataframe.py

@@ -6126,7 +6126,7 @@ def make_binop_func(op, postprocess=None):
     # def postprocess(left, right, output)
     # where left and right are the inputs to the binop and output is the result
     # of calling the wrapped Frame binop.
-    wrapped_func = getattr(Frame, op)
+    wrapped_func = getattr(IndexedFrame, op)
 
     @functools.wraps(wrapped_func)
     def wrapper(self, other, axis="columns", level=None, fill_value=None):