ENH: generalize and export fetch output about civis-r

[keithing]

This could be pretty simple if we only returned a file id, allowing users to compose the functions (so they could use read_civis or download_civis if needed). The function could simply return all the outputs of script identified by name (defaulting to the most recent run).

>>> job_id <- -999999
>>> x <- fetch_output_file_ids(job_id, run_id=NULL)
>>> x

$some_image.png
[1] 39023

$some_data.json
[1] 232

>>> df <- read_civis(x[["some_data.json"]], using = jsonlite::fromJSON)

[keithing]

Yeah, that would be great. It would also be really nice if we had a default of run_id=NULL and it just grabs the output from the most recent run.

[patr1ckm]

Ohhhhh I love that!

[hinnefe2]

Just chiming in with a +1 for exposing the function - I literally just wrote a function to do this myself.