build Rust tests into rippled instead of needing hex strings

[mvadari]

High Level Overview of Change

Biggest change: you'd need cargo to build rippled

Context of Change

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)
• Performance (increase or change in throughput and/or latency)
• Tests (you added tests for code that already exists, or your new feature included in this PR)
• Documentation update
• Chore (no impact to binary, e.g. .gitignore, formatting, dropping support for older tooling)
• Release

API Impact

• Public API: New feature (new methods and/or new fields)
• Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• Peer protocol change (must be backward compatible or bump the peer protocol version)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.8%. Comparing base (ece3a8d) to head (20f1667).
Report is 4 commits behind head on ripple/smart-escrow.

Additional details and impacted files

@@                  Coverage Diff                  @@
##           ripple/smart-escrow   #5553     +/-   ##
=====================================================
+ Coverage                 78.7%   78.8%   +0.1%     
=====================================================
  Files                      825     825             
  Lines                    73098   73088     -10     
  Branches                  8548    8516     -32     
=====================================================
+ Hits                     57553   57582     +29     
+ Misses                   15545   15506     -39     

see 8 files with indirect coverage changes

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