Backport ledger connection

[angrybayblade]

Proposed changes

Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request.

Fixes

If it fixes a bug or resolves a feature request, be sure to link to that issue.

Types of changes

What types of changes does your code introduce to agents-aea?
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• Bugfix (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)

Checklist

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• I have read the CONTRIBUTING doc
• I am making a pull request against the develop branch (left side). Also you should start your branch off our develop.
• Lint and unit tests pass locally with my changes and CI passes too
• I have added tests that prove my fix is effective or that my feature works
• I have checked that code coverage does not decrease.
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

[codecov-commenter]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (a69aaf3) 91.97% compared to head (4eade15) 91.95%.
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #679      +/-   ##
==========================================
- Coverage   91.97%   91.95%   -0.02%     
==========================================
  Files         371      371              
  Lines       29591    29621      +30     
==========================================
+ Hits        27216    27238      +22     
- Misses       2375     2383       +8     

Flag	Coverage Δ
unittests	91.95% <65.38%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
packages/valory/connections/ledger/__init__.py	100.00% <ø> (ø)
packages/valory/connections/ledger/base.py	100.00% <100.00%> (ø)
...ges/valory/connections/ledger/ledger_dispatcher.py	100.00% <100.00%> (ø)
...s/valory/connections/ledger/contract_dispatcher.py	82.11% <18.18%> (-6.28%)	⬇️

... and 3 files with indirect coverage changes

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