Feature/state vars smoothing

[jgiven100]

Describe the PR

• [x] Allows user selection of a single state_vars for smoothing via the input .json
• [x] Currently smooths state variable after computing stress (unsure if best location?)
• [ ] Need help to add mpi_size > 1 portion to mpm_scheme.tcc (marked as \\TODO in file)
• [ ] Looking for general feedback

Related Issues/PRs https://github.com/cb-geo/mpm/issues/694

Additional context The proposed implementation requires the following additional information in the input .json:

  "analysis": {
    ...,
    "state_variable_smoothing":[
      {
        "smoothing" : true,
        "state_variable" : "pdstrain"
      }
    ]
  },

[codecov[bot]]

Codecov Report

Merging #699 (073fac4) into develop (70da0c5) will decrease coverage by 0.16%. The diff coverage is 6.52%.

@@             Coverage Diff             @@
##           develop     #699      +/-   ##
===========================================
- Coverage    96.77%   96.61%   -0.16%     
===========================================
  Files          130      130              
  Lines        25834    25880      +46     
===========================================
+ Hits         24999    25002       +3     
- Misses         835      878      +43     

Impacted Files	Coverage Δ
include/node.h	93.55% <0.00%> (-6.45%)	:arrow_down:
include/node_base.h	100.00% <ø> (ø)
include/particles/particle.h	100.00% <ø> (ø)
include/particles/particle.tcc	92.21% <0.00%> (-3.00%)	:arrow_down:
include/particles/particle_base.h	100.00% <ø> (ø)
include/solvers/mpm_scheme/mpm_scheme.tcc	63.10% <0.00%> (-4.85%)	:arrow_down:
include/node.tcc	92.56% <7.69%> (-3.42%)	:arrow_down:
include/solvers/mpm_explicit.tcc	89.71% <33.33%> (-5.46%)	:arrow_down:

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[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[jgiven100]

Not considering this approach anymore -> closing.