XLS-70d Credentials

[oleks-rip]

High Level Overview of Change

Implementation of Credentials feature. It extend usage of Deposit Authorization
Now account that require pre-authorization can setup DepositPreauth object with allowed credentials. And only accounts that have been authorized by the specified issuer (and get credentials from them) will be allowed to send the payments. Please check XLS-70d for detailed description of the feature.

Context of Change

• Added new ledger object CREDENTIAL and its transactions - CredentialCreate, CredentialAccept, CredentialDelete
• DEPOSIT_PREAUTH ledger object updated to be able to use credentials. Updated transactions: DepositPreauth,
• Updated transactions to use credentials in their parameters: Payment, EscrowFinish, AccountDelete, PaymentChannelClaim

API Impact

• Public API: deposit_authorized added credentials field.
• Public API: ledger_entry added authorize_credentials to deposit_preauth field.
• Public API: ledger_entry added credential parameter.

[codecov]

Codecov Report

Attention: Patch coverage is 97.15142% with 19 lines in your changes missing coverage. Please review.

Project coverage is 77.8%. Comparing base (c5c0e70) to head (cd9b5c9).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/xrpld/app/misc/CredentialHelpers.cpp	93.6%	8 Missing ⚠️
src/xrpld/app/tx/detail/Credentials.cpp	96.7%	6 Missing ⚠️
src/xrpld/app/tx/detail/DepositPreauth.cpp	96.4%	4 Missing ⚠️
src/xrpld/app/tx/detail/PayChan.cpp	93.8%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #5103     +/-   ##
=========================================
+ Coverage     77.7%   77.8%   +0.2%     
=========================================
  Files          779     782      +3     
  Lines        66015   66614    +599     
  Branches      8156    8163      +7     
=========================================
+ Hits         51261   51859    +598     
- Misses       14754   14755      +1     

Files with missing lines	Coverage Δ
include/xrpl/protocol/ErrorCodes.h	100.0% <ø> (ø)
include/xrpl/protocol/Feature.h	100.0% <ø> (ø)
include/xrpl/protocol/HashPrefix.h	100.0% <ø> (ø)
include/xrpl/protocol/Indexes.h	100.0% <100.0%> (ø)
include/xrpl/protocol/TER.h	100.0% <ø> (ø)
include/xrpl/protocol/UintTypes.h	100.0% <100.0%> (ø)
include/xrpl/protocol/detail/ledger_entries.macro	100.0% <100.0%> (ø)
include/xrpl/protocol/detail/transactions.macro	100.0% <100.0%> (ø)
src/libxrpl/protocol/ErrorCodes.cpp	71.4% <ø> (ø)
src/libxrpl/protocol/Indexes.cpp	98.0% <100.0%> (+0.1%)	⬆️
... and 21 more

... and 15 files with indirect coverage changes

[gregtatcam]

👍 LGTM
Nice job on this!

[mvadari]

@ximinez this is ready to merge.

Commit message:

Introduce Credentials support (XLS-70d): (#5103)
    
    Amendment:
    - Credentials
    
    New Transactions:
    - CredentialCreate
    - CredentialAccept
    - CredentialDelete
    
    Modified Transactions:
    - DepositPreauth
    - Payment
    - EscrowFinish
    - PaymentChannelClaim
    - AccountDelete
    
    New Object:
    - Credential

    Modified Object:
    - DepositPreauth
    
    API updates:
    - ledger_entry
    - account_objects
    - ledger_data
    - deposit_authorized
    
    Read full spec: https://github.com/XRPLF/XRPL-Standards/tree/master/XLS-0070d-credentials