Dispersion equivalence

[cmichelenstrofer]

🚨 Checklist

• Read and follow the Contributing Guidelines.
• Provide a more detailed description below, including referencing or closing the relevant issue(s)

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PR Description

• Closes 🚀 Feature Request: Dispersion relation for Periodic equivalence. #42.
• Adds an equivalence to extend Periodic by using a specific, user-supplied, dispersion-relation
• This allows converting between temporal and spatial frequencies

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (4924035) 83.66% compared to head (9444f1d) 85.00%.

Files	Patch %	Lines
src/equivalences.jl	69.23%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   83.66%   85.00%   +1.33%     
==========================================
  Files           7        7              
  Lines         202      220      +18     
==========================================
+ Hits          169      187      +18     
  Misses         33       33              

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