Add nlopt as extra peg it

[boverhof]

Fixes/Addresses:

#1273

Summary/Motivation:

Add extras dependency so can peg nlopt to a version that is compatible with FOQUS matplotlib 2.7.5/numpy

Changes proposed in this PR:

• setup.py add nlopt to extras

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.08%. Comparing base (bb11943) to head (3d12e46).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1274      +/-   ##
==========================================
+ Coverage   39.05%   39.08%   +0.02%     
==========================================
  Files         165      165              
  Lines       37745    37745              
  Branches     5864     5864              
==========================================
+ Hits        14740    14751      +11     
+ Misses      21879    21865      -14     
- Partials     1126     1129       +3     

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