accomodate datasets w/ duplicate filenames, but in different subdirectories for DataONE recipe input type

[rmarow]

Discovered and discussed in #147

subdir_a/0.tif
subdir_b/0.tif
subdir_c/0.tif
In this case, we might want to get all of the 0.tif and maintain the directory structure.

The duplicate filenames but in different subdirectories happens a lot, especially with standard tile directory layouts like WMTS. Here's a real example from PDG data:

https://arcticdata.io/data/10.18739/A2KW57K57/iwp_geopackage_high/WGS1984Quad/15/4773/3479.gpkg
https://arcticdata.io/data/10.18739/A2KW57K57/iwp_geopackage_high/WGS1984Quad/15/4774/3479.gpkg

[rmarow]

Rikki wants to download from this dataset so we are going to create a recipe and it has this subdirectory case so beginning work on that! https://arcticdata.io/catalog/view/doi:10.18739/A2NS0M06B

^ This case ended up being similar but not related