Add EXST1 parser

[rodrigomha]

No description provided.

[codecov]

Codecov Report

Merging #892 (023651e) into master (70cbdfd) will increase coverage by 0.11%.
The diff coverage is n/a.

❗ Current head 023651e differs from pull request most recent head 6b6b687. Consider uploading reports for the commit 6b6b687 to get more accurate results

@@            Coverage Diff             @@
##           master     #892      +/-   ##
==========================================
+ Coverage   89.07%   89.18%   +0.11%     
==========================================
  Files         153      153              
  Lines        7371     7206     -165     
==========================================
- Hits         6566     6427     -139     
+ Misses        805      779      -26     

Flag	Coverage Δ
unittests	89.18% <ø> (+0.11%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/parsers/common.jl	65.51% <0.00%> (-1.15%)	⬇️
src/models/operational_cost.jl	84.78% <0.00%> (-0.94%)	⬇️
src/models/static_injection_subsystem.jl	80.95% <0.00%> (-0.87%)	⬇️
src/models/HybridSystem.jl	70.12% <0.00%> (-0.76%)	⬇️
...rc/utils/network_calculations/ptdf_calculations.jl	65.51% <0.00%> (-0.59%)	⬇️
src/models/serialization.jl	91.37% <0.00%> (-0.43%)	⬇️
src/parsers/power_models_data.jl	91.80% <0.00%> (-0.35%)	⬇️
src/parsers/psse_dynamic_data.jl	93.02% <0.00%> (-0.34%)	⬇️
src/utils/power_flow.jl	96.68% <0.00%> (-0.18%)	⬇️
...rc/utils/network_calculations/ybus_calculations.jl	96.33% <0.00%> (-0.17%)	⬇️
... and 10 more