feat: add simulate RPC to dry-run a tx (XLS-69d)

[mvadari]

High Level Overview of Change

This PR adds a new API method, titled simulate, which executes a dry run of a transaction submission.

This PR also fixes #5070.

Context of Change

It is useful to take a transaction, simulate execution it in the current ledger, and return the metadata - but not persist the transaction in the ledger. This can be used for testing, analysis, and more.

XLS spec: XRPLF/XRPL-Standards#207

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)

Test Plan

Testing is still in progress. Unit tests are and will be added.

Current Status

This PR is complete and ready for review. You can build this branch and sync with the network of your choice (including Mainnet). The public is welcome to test and use this code (at your own risk). Next steps are code review and QA testing.

[codecov]

Codecov Report

Attention: Patch coverage is 99.24528% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.0%. Comparing base (9d58f11) to head (8357e89).

Files with missing lines	Patch %	Lines
src/xrpld/rpc/detail/TransactionSign.cpp	98.5%	1 Missing ⚠️
src/xrpld/rpc/handlers/Simulate.cpp	99.2%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #5069     +/-   ##
=========================================
+ Coverage     77.9%   78.0%   +0.1%     
=========================================
  Files          782     783      +1     
  Lines        66616   66816    +200     
  Branches      8161    8128     -33     
=========================================
+ Hits         51902   52105    +203     
+ Misses       14714   14711      -3     

Files with missing lines	Coverage Δ
include/xrpl/protocol/ErrorCodes.h	100.0% <ø> (ø)
src/libxrpl/protocol/ErrorCodes.cpp	71.4% <ø> (ø)
src/libxrpl/protocol/InnerObjectFormats.cpp	100.0% <100.0%> (ø)
src/xrpld/app/ledger/detail/LedgerMaster.cpp	44.0% <100.0%> (-0.1%)	⬇️
src/xrpld/app/ledger/detail/OpenLedger.cpp	73.4% <100.0%> (+0.3%)	⬆️
src/xrpld/app/main/Main.cpp	79.8% <ø> (ø)
src/xrpld/app/misc/NetworkOPs.cpp	70.1% <100.0%> (+<0.1%)	⬆️
src/xrpld/app/misc/TxQ.h	98.2% <ø> (ø)
src/xrpld/app/misc/detail/TxQ.cpp	98.9% <100.0%> (+0.1%)	⬆️
src/xrpld/app/tx/applySteps.h	100.0% <ø> (ø)
... and 17 more

... and 8 files with indirect coverage changes

[mvadari]

This is now fully finished and ready for review.