[Doc]: Document setters and getters from private superclasses

Nobody has claimed this yet.

### Documentation Link

https://matplotlib.org/devdocs/api/image_api.html#matplotlib.image.AxesImage.set

### Problem

The above is one example, but there are some cases where the superclass is common and therefore the corresponding setters and getters are not documented. For images, it is `alpha`, `array`, `data`, `filternorm`, `filterrad`, `interpolation`, `interpolation_stage`, and `resample` that has getters and setters with doc-strings, but since `_ImageBase` is private they are not shown.

Also, other common methods as `can_composite`, `get_size`, `get_shape`, and `write_png` are shown in the documentation.

### Suggested improvement

Figure out how to add these in a good way. There are probably more classes where this happens.

Start from the linked AxesImage.set documentation and inspect how inherited members from the private _ImageBase superclass are currently exposed. Document the listed image getters and setters without exposing inappropriate private APIs, and check whether other classes have the same omission.

Written by the indexing model from the issue text.