feat: support similarterm for arrayop

[AayushSabharwal]

This is required in MTK to be able to generate functions for expressions like

@variables x[1:3] p[1:3, 1:3]
expr = bar(x, 3p)

Where bar is a @register_array_symbolic function

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 76.38%. Comparing base (79c4e92) to head (58b9066).
Report is 116 commits behind head on master.

Files	Patch %	Lines
src/arrays.jl	90.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1095      +/-   ##
==========================================
- Coverage   77.07%   76.38%   -0.69%     
==========================================
  Files          32       34       +2     
  Lines        3533     3621      +88     
==========================================
+ Hits         2723     2766      +43     
- Misses        810      855      +45     

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