DOC: add source link to properties
The current version of `linkcode_resolve` is unable to handle properties and ignore them. Hence there are no links to the source code for properties unlike for everything else. This add support to properties I did in https://github.com/geopandas/geopandas/pull/2526#issuecomment-1212926545 which is based on pandas code, so I thought it is worth contributing the enhancement back.
Sounds reasonable. Could you show a before/after example of a docstring that is positively impacted? Stuff like `GeoSeries.size` or `GeoDataFrame.axes` currently don't have a `[source]` link shown in the API docs:
<img width="796" alt="Screenshot 2022-08-12 at 20 32 41" src="https://user-images.githubusercontent.com/36797143/184421935-759b7c6d-ebe5-4dc3-bae9-76d0fe307750.png">

Docs rendered in this PR have the link to Github source code as all methods and functions already have.

 
<img width="790" alt="Screenshot 2022-08-12 at 20 33 37" src="https://user-images.githubusercontent.com/36797143/184422056-21f895c5-7803-4591-8076-2b8b04785652.png">

The link for this specific example points [here](https://github.com/pandas-dev/pandas/blob/main/pandas/core/frame.py#L851-L866).
 Thanks @martinfleis 