Open response body in pager

[ttytm]

Feature Description

Similar how the Edit Collection action opens the collection file in an editor, it would be great to have the ability to open a body in a pager which can be specified via the config or an environment variable.

For example, what I'm current getting from https://github.com/antonmedv/fx is the ability regexp-search in a body - independently of knowing it's keys - and to get further information about it's contents - like sizes of objects and arrays.

Ref.:

It also allows for folding, which is related to providing a solution for #398

Features like this might become native in slumber one day. Until then users wouldn't have to make compromises when having the possibility of using an additional viewer directly from within slumber.

Additional Context

For example the posting python project allows to specify a regular pager, and a json_pager.