Modularise HashRouter, Conditions, and OrderBookDB

[a1q123456]

High Level Overview of Change

This PR modularises HashRouter, xrpld/conditions, and OrderBookDB to libxrpl to help modularisation.

Context of Change

app/tx depends on those components so we need to modularise them.

This PR is part of the modularisation of the transactors. See all PRs here:
#6222
#6223
#6224
#6225
#6226
#6227
#6228

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 92.72727% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.2%. Comparing base (f518dd5) to head (883d0d6).

Files with missing lines	Patch %	Lines
src/xrpld/core/detail/ServiceRegistryImpl.cpp	50.0%	2 Missing ⚠️
src/xrpld/app/ledger/OrderBookDBImpl.cpp	96.0%	1 Missing ⚠️
src/xrpld/app/misc/NetworkOPs.cpp	0.0%	1 Missing ⚠️

Additional details and impacted files

@@                             Coverage Diff                             @@
##           a1q123456/modularise-networkops-interface   #6226     +/-   ##
===========================================================================
+ Coverage                                       79.2%   79.2%   +0.1%     
===========================================================================
  Files                                            843     845      +2     
  Lines                                          71694   71719     +25     
  Branches                                        8304    8277     -27     
===========================================================================
+ Hits                                           56758   56816     +58     
+ Misses                                         14936   14903     -33     

Files with missing lines	Coverage Δ
include/xrpl/conditions/Condition.h	100.0% <ø> (ø)
include/xrpl/conditions/Fulfillment.h	100.0% <ø> (ø)
include/xrpl/conditions/detail/PreimageSha256.h	77.8% <ø> (ø)
include/xrpl/conditions/detail/utils.h	69.9% <ø> (ø)
include/xrpl/core/HashRouter.h	100.0% <ø> (ø)
include/xrpl/core/ServiceRegistry.h	100.0% <ø> (ø)
include/xrpl/ledger/AcceptedLedgerTx.h	100.0% <ø> (ø)
include/xrpl/ledger/BookListeners.h	100.0% <ø> (ø)
include/xrpl/ledger/OrderBookDB.h	100.0% <100.0%> (ø)
src/libxrpl/conditions/Condition.cpp	56.6% <ø> (ø)
... and 39 more

... and 7 files with indirect coverage changes

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