XLS-60d: DefaultAutoBridge

[tequdev]

High Level Overview of Change

Changes the internal default path to include the path of the XRP bridge if sfPaths is unspecified in the Payment transaction.

Context of Change

XRPLF/XRPL-Standards#175

Type of Change

• New feature (non-breaking change which adds functionality)
• Tests (you added tests for code that already exists, or your new feature included in this PR)

Before / After

If relevant, use this section for an English description of the change at a technical level.
If no path is specified, the impact of the transaction on the node is increased, but if a path is set to mediate XRP, the impact on the node is unaffected.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.42857% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 76.98%. Comparing base (c88166e) to head (7e4a770).

Files	Patch %	Lines
src/test/app/Flow_test.cpp	95.83%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4923      +/-   ##
===========================================
+ Coverage    76.97%   76.98%   +0.01%     
===========================================
  Files         1129     1129              
  Lines       131914   132045     +131     
  Branches     39629    39726      +97     
===========================================
+ Hits        101539   101659     +120     
- Misses       24459    24519      +60     
+ Partials      5916     5867      -49     

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