`request_url` handling of default args and other args

[dshemetov]

print(call) did provide "the" request_url by default before, but the problem is that the request URL changes based on what further options we provide; see the args to request_url. If you think if a better name for request-URL-with-default-args-for-request_url-but-other-arguments-baked-in, please add it!

Originally posted by @brookslogan in #81 (comment)

Ideal workflow is something like: print(call) by default pretty prints the args and the request url with all the correct arguments set. Implementation details unclear though.

[brookslogan]

More context:

Question: what do you think of having print(call) provide the request_url by default (along with a pretty print of its params)? Or did you try this and run into a bug? It would be nice if the call pretty print was small enough to be viewable without scrolling (like a tibble preview). Maybe there's a pretty print package for lists that accomplishes that?

Originally posted by @dshemetov in #81 (comment)

cli is supposed to take care of line wrapping, which is mostly why I used it there. (R has some built-in utilities that help for line wrapping but to still get things exactly how you want them it requires some work; we have helpers for it in epiprocess but probably want to move to using cli since it's probably now a transitive Imports: rather than Suggests:.) Is there an issue with how it's formatting things for you? What list are you thinking of pretty-printing?

[dshemetov]

Oh, so the list I was thinking about was the list of all params that epidata_call object used to print, before you cleaned it up in #81. So not needed anymore. Also in #81, I modified print.epidata_call to automatically print the request_url using the classic format (I figure someone who wants to get a different format url can just call request_url with a format arg), so that will close this issue.