Adding Physical Time to VTK Outputs for #727

[mfontaine218]

Describe the PR
Added physical time to MPI-parallel VTK outputs so that physical simulation time can be seen in ParaView visualization, .pvd files are created for each attribute with time step included.

Related Issues/PRs
Related to issue #727

[jgiven100]

@mfontaine218 Looks like you'll need to run clang-format to get the circleci checks to pass

[shellshocked2003]

@mfontaine218, as @jgiven100 pointed out, the build is failing due to file formatting not meeting the repository standard. Running clang-format will automatically adjust the files to the specified formatting, so shouldn't be a hard fix. Please let me know if you have any issues/questions about that.

[codecov]

Codecov Report

Merging #729 (bd3284d) into develop (adfe6f1) will decrease coverage by 0.02%.
The diff coverage is 75.86%.

@@             Coverage Diff             @@
##           develop     #729      +/-   ##
===========================================
- Coverage    96.75%   96.73%   -0.02%     
===========================================
  Files          130      130              
  Lines        25932    25961      +29     
===========================================
+ Hits         25090    25112      +22     
- Misses         842      849       +7     

Impacted Files	Coverage Δ
include/solvers/mpm_base.tcc	77.04% <ø> (ø)
src/io/vtk_writer.cc	92.90% <74.07%> (-3.97%)	⬇️
tests/io/vtk_writer_test.cc	97.18% <100.00%> (+0.08%)	⬆️

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[kks32]

Looks good.

[kks32]

What happens on a Windows system?