Add solve method to SpectrumSolver

[andrewfullard]

📝 Description

Type: 🚀 feature

Fixes #2732

🚦 Testing

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☑️ Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.37%. Comparing base (38a35c3) to head (04ca7dc).
Report is 7 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2735       +/-   ##
===========================================
+ Coverage   36.58%   68.37%   +31.79%     
===========================================
  Files         186      190        +4     
  Lines       14859    15365      +506     
===========================================
+ Hits         5436    10506     +5070     
+ Misses       9423     4859     -4564     

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