Modularise WalletDB and Manifest

[a1q123456]

High Level Overview of Change

This PR modularises the walletdb and manifest. Please be aware that the wallet db actually has nothing to do with account wallets and it stores node configuration, which is why it depends on Manifest.

Context of Change

To help modularisation, the wallet db has to be modularised.

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

[codecov]

Codecov Report

❌ Patch coverage is 84.11765% with 27 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.2%. Comparing base (5ff7222) to head (c9dbea1).

Files with missing lines	Patch %	Lines
...rc/xrpld/app/rdb/backend/detail/SQLiteDatabase.cpp	54.2%	11 Missing ⚠️
src/libxrpl/rdb/DatabaseCon.cpp	64.3%	10 Missing ⚠️
src/xrpld/core/detail/ServiceRegistryImpl.cpp	60.0%	4 Missing ⚠️
src/xrpld/app/main/Application.cpp	88.9%	1 Missing ⚠️
src/xrpld/core/detail/Config.cpp	98.9%	1 Missing ⚠️

Additional details and impacted files

@@                       Coverage Diff                        @@
##           a1q123456/add_service_registry   #6223     +/-   ##
================================================================
- Coverage                            79.2%   79.2%   -0.0%     
================================================================
  Files                                 842     843      +1     
  Lines                               71693   71717     +24     
  Branches                             8282    8285      +3     
================================================================
+ Hits                                56777   56794     +17     
- Misses                              14916   14923      +7     

Files with missing lines	Coverage Δ
include/xrpl/core/PeerReservationTable.h	25.0% <ø> (ø)
include/xrpl/core/ServiceRegistry.h	100.0% <ø> (ø)
include/xrpl/core/StartUpType.h	100.0% <100.0%> (ø)
include/xrpl/rdb/DatabaseCon.h	100.0% <100.0%> (ø)
include/xrpl/rdb/SociDB.h	100.0% <ø> (ø)
include/xrpl/server/Manifest.h	76.7% <ø> (ø)
src/libxrpl/rdb/SociDB.cpp	60.7% <ø> (ø)
src/libxrpl/server/State.cpp	89.6% <ø> (ø)
src/libxrpl/server/Vacuum.cpp	0.0% <ø> (ø)
src/libxrpl/server/Wallet.cpp	76.3% <ø> (ø)
... and 24 more

... and 2 files with indirect coverage changes

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