Added NZ testing and collection regions, parser and test

[pabloitu]

addresses #176

Type of change:

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov-commenter]

Codecov Report

Base: 55.73% // Head: 55.46% // Decreases project coverage by -0.27% ⚠️

Coverage data is based on head (ad340a2) compared to base (74106b9).
Patch coverage: 27.77% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #198      +/-   ##
==========================================
- Coverage   55.73%   55.46%   -0.28%     
==========================================
  Files          20       20              
  Lines        3572     3608      +36     
  Branches      569      579      +10     
==========================================
+ Hits         1991     2001      +10     
- Misses       1460     1482      +22     
- Partials      121      125       +4     

Impacted Files	Coverage Δ
csep/core/regions.py	45.59% <27.77%> (-1.16%)	⬇️

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[wsavran]

linking #176