Replace libecl RNG with numpy.random.Generator

[pinkwah]

All sampling is now done in Python. This means we can replace the old crusty RNG implementation with a standardised and well-tested implementation.

Resolves: #4014
Resolves: #2351

[codecov-commenter]

Codecov Report

Merging #4033 (5a37968) into main (c7b167b) will increase coverage by 17.44%.
The diff coverage is 67.56%.

@@             Coverage Diff             @@
##             main    #4033       +/-   ##
===========================================
+ Coverage   40.71%   58.16%   +17.44%     
===========================================
  Files         526      526               
  Lines       39347    39305       -42     
  Branches     3562     3554        -8     
===========================================
+ Hits        16021    22862     +6841     
+ Misses      22393    15511     -6882     
+ Partials      933      932        -1     

Impacted Files	Coverage Δ
src/clib/lib/analysis/update.cpp	3.17% <ø> (+0.18%)	⬆️
src/clib/lib/enkf/enkf_main.cpp	3.33% <ø> (+0.47%)	⬆️
src/clib/lib/enkf/enkf_node.cpp	1.68% <0.00%> (ø)
src/clib/lib/enkf/enkf_state.cpp	2.18% <0.00%> (-0.54%)	⬇️
src/clib/lib/enkf/field.cpp	0.94% <0.00%> (ø)
src/clib/lib/enkf/gen_data.cpp	26.52% <ø> (ø)
src/clib/lib/include/ert/analysis/update.hpp	0.00% <ø> (ø)
src/clib/lib/include/ert/enkf/enkf_util.hpp	0.00% <0.00%> (ø)
src/clib/lib/enkf/surface.cpp	2.66% <100.00%> (+1.33%)	⬆️
src/ert/_c_wrappers/enkf/enkf_main.py	95.23% <100.00%> (-2.10%)	⬇️
... and 245 more

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[dafeda]

Beautiful 👍