Request: add pandas / numpy array support

[guidopetri]

Is your feature request related to a problem? Please describe.

I'm trying to use snapshots with pandas dataframes but it seems difficult to build my own extension separately from syrupy and use it across multiple projects. It also seems less than ideal to serialize the dataframe as text since this loses typing and precision information.

Describe the solution you'd like

I'd like to be able to do this:

assert pd.DataFrame(['test']) == snapshot

Describe alternatives you've considered

Pandas allows for conversion to other formats, e.g. csv/json. Serializing to these formats is not very readable and can lose information (e.g. CSV does not contain types), and does not support custom python objects.

Additional context

I've seen #786 and the code that that commenter wrote, but to use that extension you have to override private methods, and that doesn't seem ideal - if the private methods change, then all the projects using that extension are now broken. Additionally, there's no easy way to import that code, it'd have to be maintained across multiple projects.