Changes rippled to use east const convention

[Tapanito]

This PR refactors rippled codebase to use east const convention, and adds clang-format rule to follow this convention.

The PR is split into multiple commits for ease of reviewing.

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

Attention: Patch coverage is 80.61224% with 57 lines in your changes missing coverage. Please review.

Project coverage is 78.1%. Comparing base (405f461) to head (9bdb66a).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/xrpld/app/ledger/LedgerHistory.cpp	3.4%	28 Missing ⚠️
src/libxrpl/json/json_valueiterator.cpp	61.5%	5 Missing ⚠️
src/xrpld/overlay/detail/PeerImp.cpp	20.0%	4 Missing ⚠️
src/xrpld/consensus/Consensus.h	62.5%	3 Missing ⚠️
src/xrpld/core/detail/Job.cpp	25.0%	3 Missing ⚠️
src/xrpld/peerfinder/detail/Logic.h	0.0%	3 Missing ⚠️
src/xrpld/app/tx/detail/CancelOffer.cpp	50.0%	2 Missing ⚠️
include/xrpl/protocol/STArray.h	50.0%	1 Missing ⚠️
src/libxrpl/json/json_reader.cpp	83.3%	1 Missing ⚠️
src/libxrpl/protocol/STBase.cpp	80.0%	1 Missing ⚠️
... and 6 more

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #5409   +/-   ##
=======================================
  Coverage     78.1%   78.1%           
=======================================
  Files          795     795           
  Lines        68598   68601    +3     
  Branches      8283    8281    -2     
=======================================
+ Hits         53580   53589    +9     
+ Misses       15018   15012    -6     

Files with missing lines	Coverage Δ
include/xrpl/basics/BasicConfig.h	87.2% <100.0%> (ø)
include/xrpl/basics/CompressionAlgorithms.h	0.0% <ø> (ø)
include/xrpl/basics/Expected.h	100.0% <ø> (ø)
include/xrpl/basics/TaggedCache.h	100.0% <ø> (ø)
include/xrpl/basics/TaggedCache.ipp	85.6% <ø> (ø)
include/xrpl/basics/base_uint.h	96.8% <100.0%> (ø)
include/xrpl/basics/partitioned_unordered_map.h	99.2% <ø> (ø)
include/xrpl/basics/tagged_integer.h	100.0% <100.0%> (ø)
include/xrpl/beast/utility/temp_dir.h	100.0% <ø> (ø)
include/xrpl/json/json_reader.h	100.0% <ø> (ø)
... and 141 more

... and 3 files with indirect coverage changes

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