feat: add OrderInstructions

[ethanwlee]

per the tbdex spec, this pr adds the OrderInstructions message and removes the PaymentInstruction object from the Quote message

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.96491% with 8 lines in your changes missing coverage. Please review.

Project coverage is 93.25%. Comparing base (b28cbe5) to head (bccfe8e).

Files	Patch %	Lines
Sources/tbDEX/Protocol/DevTools.swift	74.07%	7 Missing ⚠️
...es/tbDEX/Protocol/Models/Messages/AnyMessage.swift	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
- Coverage   93.65%   93.25%   -0.40%     
==========================================
  Files          32       34       +2     
  Lines        1245     1290      +45     
==========================================
+ Hits         1166     1203      +37     
- Misses         79       87       +8     

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