Add an associated displacement workflow to a DataFrame

[PProfizi]

For animations on a deformed mesh. A DataFrame holds a reference to a displacement query workflow to get displacement fields for updated coordinates whenever necessary. The ouptut of this workflow is passed to the Plotter as a deform_by argument.

[codecov[bot]]

Codecov Report

Merging #309 (c089004) into post_refactor (41585af) will decrease coverage by 0.03%. The diff coverage is 85.24%.

@@                Coverage Diff                @@
##           post_refactor     #309      +/-   ##
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- Coverage          82.66%   82.64%   -0.03%     
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  Files                 35       35              
  Lines               3098     3146      +48     
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+ Hits                2561     2600      +39     
- Misses               537      546       +9