refactor: Make token issuances type-safe

[mvadari]

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

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 81.6%. Comparing base (ea3ca12) to head (dae0a53).

Files with missing lines	Patch %	Lines
src/libxrpl/protocol/Indexes.cpp	0.0%	1 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                    @@
##           mvadari/rearch/account   #6621     +/-   ##
========================================================
- Coverage                    81.6%   81.6%   -0.0%     
========================================================
  Files                        1011    1011             
  Lines                       76090   76090             
  Branches                     7640    7640             
========================================================
- Hits                        62071   62070      -1     
- Misses                      14019   14020      +1     

Files with missing lines	Coverage Δ
include/xrpl/protocol/Indexes.h	100.0% <ø> (ø)
src/libxrpl/protocol/Indexes.cpp	96.0% <0.0%> (ø)

... and 1 file with indirect coverage changes

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[github-actions]

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[github-actions]

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