Added sdoe tests

[franflame]

Added sdoe tests, configuration files, and sample candidates

Resolves: #1083

Summary/Motivation:

Increase test coverage for sdoe core functionalities

Changes proposed in this PR:

• add tests for distance.py, irsf.py, usf.py, nusf.py, and sdoe.py
• add config.ini and candidates.csv files to test sdoe.run()

Legal Acknowledgement

By contributing to this software project, I agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the copyright and license terms described in the LICENSE.md file at the top level of this directory.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[ksbeattie]

The .py files should get the updated copyright header once PR #1112 is merged.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +1.62 🎉

Comparison is base (99ae991) 33.31% compared to head (8640ee1) 34.94%.

❗ Current head 8640ee1 differs from pull request most recent head 19c1da4. Consider uploading reports for the commit 19c1da4 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1115      +/-   ##
==========================================
+ Coverage   33.31%   34.94%   +1.62%     
==========================================
  Files         161      161              
  Lines       36426    36426              
  Branches     5950     5950              
==========================================
+ Hits        12136    12729     +593     
+ Misses      23330    22715     -615     
- Partials      960      982      +22     

see 6 files with indirect coverage changes

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[sotorrio1]

LGTM!

[lbianchi-lbl]

Coverage improvements due to this PR:

[lbianchi-lbl]

Blocking this until the copyright header has been added.