Add animate_transient and refactor FieldsContainer.animate() to use it

[PProfizi]

No description provided.

[codecov]

Codecov Report

Merging #904 (5aa9653) into master (384c3fd) will decrease coverage by 0.25%.
The diff coverage is 98.03%.

@@            Coverage Diff             @@
##           master     #904      +/-   ##
==========================================
- Coverage   88.62%   88.37%   -0.25%     
==========================================
  Files          73       73              
  Lines        8288     8291       +3     
==========================================
- Hits         7345     7327      -18     
- Misses        943      964      +21     

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