DRAFT: Try 2^63-1 mantissa range refactoring on asan branch

[ximinez]

High Level Overview of Change

Combines #6150 and #6275.

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

❌ Patch coverage is 97.88732% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.4%. Comparing base (6334be1) to head (ddbd78c).

Files with missing lines	Patch %	Lines
src/libxrpl/basics/Number.cpp	98.3%	2 Missing ⚠️
include/xrpl/basics/Number.h	95.5%	1 Missing ⚠️

Additional details and impacted files

@@                         Coverage Diff                         @@
##           pratik/Fix_asan_lsan_flagged_issues   #6292   +/-   ##
===================================================================
  Coverage                                 79.4%   79.4%           
===================================================================
  Files                                      839     839           
  Lines                                    71629   71639   +10     
  Branches                                  8237    8235    -2     
===================================================================
+ Hits                                     56858   56868   +10     
  Misses                                   14771   14771           

Files with missing lines	Coverage Δ
include/xrpl/protocol/Protocol.h	100.0% <ø> (ø)
include/xrpl/protocol/STAmount.h	96.0% <100.0%> (+<0.1%)	⬆️
include/xrpl/protocol/SystemParameters.h	100.0% <ø> (ø)
include/xrpl/protocol/detail/ledger_entries.macro	100.0% <ø> (ø)
include/xrpl/basics/Number.h	98.1% <95.5%> (-0.7%)	⬇️
src/libxrpl/basics/Number.cpp	98.4% <98.3%> (-0.4%)	⬇️

... and 2 files with indirect coverage changes

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