Add rudimentary duecredit support using zenodo's dandi-cli DOI

[yarikoptic]

I am using Zenodo unversioned DOI

$> DUECREDIT_ENABLE=1 python -m pytest dandi/tests/test_utils.py
====================================================== test session starts ======================================================
platform linux -- Python 3.8.6, pytest-4.6.11, py-1.9.0, pluggy-0.13.0
rootdir: /home/yoh/proj/dandi/dandi-cli, inifile: tox.ini
plugins: mock-3.2.0, cov-2.10.0, pyfakefs-4.1.0, forked-1.3.0, timeout-1.4.1, xdist-1.32.0, hypothesis-5.32.1
collected 19 items                                                                                                              

dandi/tests/test_utils.py ...................                                                                             [100%]

=================================================== slowest 10 test durations ===================================================
0.01s call     dandi/tests/test_utils.py::test_find_files
0.01s setup    dandi/tests/test_utils.py::test_find_files_dotfiles

(0.00 durations hidden.  Use -vv to show these durations.)
=================================================== 19 passed in 0.07 seconds ===================================================

DueCredit Report:
- Client to interact with DANDI Archive / dandi-cli (v 0.7.2+6.g39c62bc.dirty) [1]
- Scientific tools library / numpy (v 1.19.4) [2]

2 packages cited
0 modules cited
0 functions cited

References
----------

[1] Halchenko, Y. et al., 2020. dandi/dandi-cli: 0.7.2.
[2] Van Der Walt, S., Colbert, S.C. & Varoquaux, G., 2011. The NumPy array: a structure for efficient numerical computation. Computing in Science & Engineering, 13(2), pp.22–30.

[codecov]

Codecov Report

Merging #285 (16ff607) into master (39c62bc) will decrease coverage by 0.16%.
The diff coverage is 68.00%.

@@            Coverage Diff             @@
##           master     #285      +/-   ##
==========================================
- Coverage   82.42%   82.26%   -0.17%     
==========================================
  Files          54       55       +1     
  Lines        4598     4623      +25     
==========================================
+ Hits         3790     3803      +13     
- Misses        808      820      +12     

Flag	Coverage Δ
unittests	82.26% <68.00%> (-0.17%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
dandi/due.py	68.00% <68.00%> (ø)
dandi/cli/cmd_organize.py	77.30% <0.00%> (-2.46%)	⬇️

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