feat: Support single asset vault

[PeterChen13579]

fixes #1921

[codecov]

Codecov Report

Attention: Patch coverage is 79.80769% with 21 lines in your changes missing coverage. Please review.

Project coverage is 73.22%. Comparing base (d97f19b) to head (99803fb).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/rpc/handlers/VaultInfo.cpp	85.13%	6 Missing and 5 partials ⚠️
src/rpc/handlers/VaultInfo.hpp	44.44%	0 Missing and 5 partials ⚠️
src/rpc/handlers/LedgerEntry.hpp	60.00%	0 Missing and 4 partials ⚠️
src/rpc/handlers/LedgerEntry.cpp	90.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1979      +/-   ##
===========================================
+ Coverage    73.17%   73.22%   +0.04%     
===========================================
  Files          370      372       +2     
  Lines        15145    15246     +101     
  Branches      7661     7715      +54     
===========================================
+ Hits         11083    11164      +81     
- Misses        1926     1931       +5     
- Partials      2136     2151      +15     

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[godexsoft]

Few small things. Overall looks good 👍

[mathbunnyru]

This PR shows why long-living PRs are bad - unfortunately, many things were changed universally in develop and now they have to be fixed here as well