adds sfData field to VaultDelete transaction

[Tapanito]

This PR adds an optional Data field to the VaultDelete transaction to register the reason for deletion.

Specification: XRPLF/XRPL-Standards#470

High Level Overview of Change

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 79.9%. Comparing base (74c968d) to head (667b559).

Additional details and impacted files

@@                       Coverage Diff                        @@
##           tapanito/lending-fix-amendment   #6356     +/-   ##
================================================================
- Coverage                            79.9%   79.9%   -0.0%     
================================================================
  Files                                 842     842             
  Lines                               65553   65557      +4     
  Branches                             7250    7253      +3     
================================================================
+ Hits                                52394   52396      +2     
- Misses                              13159   13161      +2     

Files with missing lines	Coverage Δ
include/xrpl/protocol/detail/transactions.macro	100.0% <ø> (ø)
src/xrpld/app/tx/detail/VaultDelete.cpp	91.8% <100.0%> (+0.6%)	⬆️

... and 2 files with indirect coverage changes

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