46 parallelize var inf

[joselotl]

Problem & Solution Description (including issue #)

This commit parallelizes point_est_hist, and var_inf. Also I rewrote naive_stack to share functions with point_est_hist.

Code Quality

• My code follows the code style of this project
• I have written unit tests or justified all instances of #pragma: no cover; in the case of a bugfix, a new test that breaks as a result of the bug has been added
• My code contains relevant comments and necessary documentation for future maintainers; the change is reflected in applicable demos/tutorials (with output cleared!) and added/updated docstrings use the NumPy docstring format
• Any breaking changes, described above, are accompanied by backwards compatibility and deprecation warnings

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (263b2a6) 96.96% compared to head (382217e) 97.17%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
+ Coverage   96.96%   97.17%   +0.21%     
==========================================
  Files          32       32              
  Lines        1714     1736      +22     
==========================================
+ Hits         1662     1687      +25     
+ Misses         52       49       -3     

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[eacharles]

Thanks Josue