setup.py: Add project_urls for PyPI

[tony]

Pull Request check-list

Please make sure to review and check all of these items:

• Does $ tox pass with this change (including linting)? N/A
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)? N/A
• Is there an example added to the examples folder (if applicable)? N/A

Description of change

This adds project_urls to setup.py. They do not take effect until the package is published

Example:

[codecov-commenter]

Codecov Report

Merging #1867 (afc1c6e) into master (15f315a) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1867      +/-   ##
==========================================
+ Coverage   93.60%   93.62%   +0.02%     
==========================================
  Files          76       76              
  Lines       16214    16214              
==========================================
+ Hits        15177    15181       +4     
+ Misses       1037     1033       -4     

Impacted Files	Coverage Δ
setup.py	0.00% <ø> (ø)
tests/test_cluster.py	98.79% <0.00%> (+0.25%)	⬆️

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[chayim]

@tony Thank you for the change. You're bang on - we have some other places we should change this as well. Much obliged. Merging.