(transform, minor): stencil-to-csl-stencil retain interesting compute structure property

[n-io]

Minor fix to retain the imbalanced tree compute structure.

Before the transform, the compute structure was of the form:
(((a + b) + c) + d)

After the transform, the compute structure was of the form:
(a + b) + (c + d)

As the imbalanced tree structure (first) is preferable for reference semantics and easier to translate, this pass should retain this property.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.90%. Comparing base (0424d07) to head (639adcb).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2926   +/-   ##
=======================================
  Coverage   89.90%   89.90%           
=======================================
  Files         404      404           
  Lines       50486    50480    -6     
  Branches     7798     7795    -3     
=======================================
- Hits        45390    45386    -4     
+ Misses       3865     3864    -1     
+ Partials     1231     1230    -1     

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