TVB-2719 Add parallelism using OpenMP

[ayan-b]

Closes #10

[codecov]

Codecov Report

Merging #65 into trunk will increase coverage by 2.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            trunk      #65      +/-   ##
==========================================
+ Coverage   75.31%   77.33%   +2.02%     
==========================================
  Files           9        9              
  Lines        1203     1209       +6     
==========================================
+ Hits          906      935      +29     
+ Misses        297      274      -23     

Flag	Coverage Δ
#cpp	76.33% <100.00%> (+2.59%)	⬆️
#python	100.00% <100.00%> (ø)

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Impacted Files	Coverage Δ
gdist.pyx	100.00% <100.00%> (ø)
geodesic_library/geodesic_utils.h	97.67% <100.00%> (+3.92%)	⬆️
...odesic_library/geodesic_algorithm_exact_elements.h	57.41% <0.00%> (+0.64%)	⬆️
geodesic_library/geodesic_algorithm_exact.h	74.48% <0.00%> (+2.41%)	⬆️
geodesic_library/geodesic_algorithm_base.h	74.28% <0.00%> (+5.71%)	⬆️
geodesic_library/geodesic_memory.h	100.00% <0.00%> (+11.76%)	⬆️

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