feat: add fixture test for pox-4 message hash

[hstove]

I meant to add this in my other PR, but I made a fixture test in Rust so that we can have one here as well

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Name	Status	Preview	Comments	Updated (UTC)
stacksjs-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 6, 2024 2:32am

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.49%. Comparing base (36558cf) to head (fefd4f0).

Additional details and impacted files

@@                           Coverage Diff                            @@
##           feat/update-stacking-client-to-pox-4    #1648      +/-   ##
========================================================================
- Coverage                                 66.51%   66.49%   -0.02%     
========================================================================
  Files                                       119      119              
  Lines                                      8756     8755       -1     
  Branches                                   1934     1934              
========================================================================
- Hits                                       5824     5822       -2     
- Misses                                     2806     2807       +1     
  Partials                                    126      126              

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[janniks]

👏 thx