Integrate mpt_utility SDK for tests

[yinyiqian1]

Adopt proof generation functions from mpt-crypto's mpt_utility SDK

High Level Overview of Change

Context of Change

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 80.1%. Comparing base (2c94e21) to head (4983c40).
⚠️ Report is 13 commits behind head on ripple/confidential-transfer.

Additional details and impacted files

@@                      Coverage Diff                       @@
##           ripple/confidential-transfer   #6705     +/-   ##
==============================================================
- Coverage                          80.2%   80.1%   -0.1%     
==============================================================
  Files                               874     874             
  Lines                             69184   68748    -436     
  Branches                           7562    7550     -12     
==============================================================
- Hits                              55464   55039    -425     
+ Misses                            13720   13709     -11     

see 6 files with indirect coverage changes

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[PeterChen13579]

LGTM