Added support for multiplication on several important types of variables

[kwesiRutledge]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 89.28571% with 3 lines in your changes missing coverage. Please review.

Project coverage is 85.70%. Comparing base (6dbb4af) to head (80f8822).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
symbolic/variable_vector.go	70.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   85.41%   85.70%   +0.28%     
==========================================
  Files          38       38              
  Lines        5676     5700      +24     
==========================================
+ Hits         4848     4885      +37     
+ Misses        763      751      -12     
+ Partials       65       64       -1     

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