Do not merge multiple operators in a single node

[chhwang]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 85.13514% with 11 lines in your changes missing coverage. Please review.

Project coverage is 90.13%. Comparing base (7a676fe) to head (2ba2d15).

Files	Patch %	Lines
ark/model/model_graph_impl.cpp	66.66%	10 Missing ⚠️
ark/api/planner.cpp	97.56%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #228      +/-   ##
==========================================
- Coverage   90.59%   90.13%   -0.47%     
==========================================
  Files         102      102              
  Lines        4031     3944      -87     
==========================================
- Hits         3652     3555      -97     
- Misses        379      389      +10     

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