add find_similarity_transform

[baggepinnen]

this was previously implemented in ControlSystemIdentification

[JuliaControlBot]

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Plots were compared to references. 3/11 images have changed, see differences below.
After pulling this PR, please update the reference images by creating a PR to ControlExamplePlots.jl here.

Difference	Reference Image	New Image
✔️ 0.0
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[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.52%. Comparing base (dbe65e6) to head (75e421d).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/ControlSystemsBase/src/matrix_comps.jl	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1000      +/-   ##
==========================================
- Coverage   92.54%   92.52%   -0.03%     
==========================================
  Files          41       41              
  Lines        5085     5095      +10     
==========================================
+ Hits         4706     4714       +8     
- Misses        379      381       +2     

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[JuliaControlBot]

This is an automated message.
Plots were compared to references. 3/11 images have changed, see differences below.
After pulling this PR, please update the reference images by creating a PR to ControlExamplePlots.jl here.

Difference	Reference Image	New Image
✔️ 0.0
✔️ 0.0
✔️ 0.0