Refactor StateMap into C++ & pybind11

[pinkwah]

No description provided.

[codecov-commenter]

Codecov Report

Merging #3693 (364571e) into main (aa0b89b) will decrease coverage by 0.17%.
The diff coverage is 48.68%.

@@            Coverage Diff             @@
##             main    #3693      +/-   ##
==========================================
- Coverage   63.28%   63.10%   -0.18%     
==========================================
  Files         595      596       +1     
  Lines       46198    46164      -34     
  Branches     4156     4219      +63     
==========================================
- Hits        29236    29134     -102     
- Misses      15667    15717      +50     
- Partials     1295     1313      +18     

Impacted Files	Coverage Δ
src/libres/lib/enkf/enkf_main.cpp	37.12% <0.00%> (-0.43%)	⬇️
src/libres/lib/enkf/enkf_plot_data.cpp	34.04% <0.00%> (+0.70%)	⬆️
src/libres/lib/enkf/enkf_plot_gen_kw.cpp	24.35% <0.00%> (ø)
src/libres/lib/enkf/enkf_plot_gendata.cpp	24.21% <0.00%> (-0.54%)	⬇️
src/libres/lib/include/ert/python.hpp	0.00% <ø> (ø)
src/libres/lib/python/init.cpp	20.51% <0.00%> (-2.07%)	⬇️
src/libres/lib/analysis/update.cpp	40.16% <25.00%> (ø)
src/libres/lib/enkf/enkf_fs.cpp	67.85% <27.77%> (-2.48%)	⬇️
src/libres/lib/enkf/enkf_state.cpp	25.10% <37.50%> (+0.20%)	⬆️
src/libres/lib/enkf/state_map.cpp	59.28% <51.53%> (-30.16%)	⬇️
... and 12 more

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[eivindjahren]

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