Annotate registered data with location labels

[Xarthisius]

What's new?

For Zenodo, Dataverse, DataONE and Globus providers this PR annotates registered data with a) location of a file/folder relative to the original dataset root b) identifier of root dataset (in case there's a specific file/folder identifier it's added as directIdentifer to metadata)

Why?

Currently this information is derived ad hoc from the structure of WholeTale Catalog using a lot of implicit assumptions regarding how registering works for a given provider. With this PR it's going to be easy to export / import external data regardless of its location in girder.

How to test?

1. Register some data. I used:
   1. https://zenodo.org/record/3463499 (nested zenodo)
   2. doi:10.7910/DVN/5WTSUZ (nested DV)
   3. https://search.dataone.org/view/urn:uuid:6f5533ab-6508-4ac7-82a3-1df88ed4580e
   4. doi:10.18126/M2301J (globus)
2. Inspect registered data in girder. Look for dsRelPath in item/folder metadata.

TODO

• [x] Update tests.

[codecov[bot]]

Codecov Report

Merging #542 (98da4b6) into master (0186a99) will decrease coverage by 0.19%. The diff coverage is 72.41%.

@@            Coverage Diff             @@
##           master     #542      +/-   ##
==========================================
- Coverage   92.87%   92.67%   -0.20%     
==========================================
  Files          58       58              
  Lines        4560     4575      +15     
==========================================
+ Hits         4235     4240       +5     
- Misses        325      335      +10     

Impacted Files	Coverage Δ
server/rest/dataset.py	88.09% <ø> (ø)
server/lib/globus/globus_provider.py	62.16% <20.00%> (-1.39%)	:arrow_down:
server/lib/dataone/provider.py	98.82% <100.00%> (+0.01%)	:arrow_up:
server/lib/dataverse/provider.py	95.98% <100.00%> (-0.74%)	:arrow_down:
server/lib/zenodo/provider.py	94.02% <100.00%> (-3.65%)	:arrow_down:

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