Add constructor to override matrices in ExtendedStateSpace

[baggepinnen]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 90.33%. Comparing base (a23715f) to head (bdaedd0).

Files with missing lines	Patch %	Lines
src/ExtendedStateSpace.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
- Coverage   90.46%   90.33%   -0.14%     
==========================================
  Files          19       19              
  Lines        2926     2928       +2     
==========================================
- Hits         2647     2645       -2     
- Misses        279      283       +4     

Flag	Coverage Δ
unittests	90.33% <60.00%> (-0.14%)	⬇️

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