Add NRN_PARALLEL_BUILDS to setup.py

[JCGoran]

Allows us to control the sought level of parallelization for the build.
Useful when building wheels locally (for debugging purposes and whatnot).

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[azure-pipelines]

✔️ 1805342 -> Azure artifacts URL

[bbpbuildbot]

Logfiles from GitLab pipeline #235190 (:white_check_mark:) have been uploaded here!

Status and direct links:

• ✅ mac_m1_cmake_build: [cmake, ON, OFF, OFF, address]
• ✅ spack_setup
• ✅ build:nmodl
• ✅ build:neuron:nmodl:intel:legacy
• ✅ build:neuron:nmodl:intel:shared
• ✅ build:neuron:nmodl:nvhpc:acc:legacy
• ✅ build:neuron:nmodl:nvhpc:acc:shared
• ✅ build:neuron:nmodl:nvhpc:omp:legacy
• ✅ build:neuron:nmodl:nvhpc:omp
• ✅ test:neuron:nmodl:intel:legacy
• ✅ test:neuron:nmodl:intel:shared
• ✅ test:neuron:nmodl:nvhpc:acc:legacy
• ✅ test:neuron:nmodl:nvhpc:acc:shared
• ✅ test:neuron:nmodl:nvhpc:omp:legacy
• ✅ test:neuron:nmodl:nvhpc:omp

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.89%. Comparing base (ab0a571) to head (1805342).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3122      +/-   ##
==========================================
- Coverage   66.89%   66.89%   -0.01%     
==========================================
  Files         572      572              
  Lines      106657   106657              
==========================================
- Hits        71352    71350       -2     
- Misses      35305    35307       +2     

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