Improving Balances.ContextValues Unmarshalling, Fixing #251

[MarcoWel]

Fixes #251

[VictorAvelar]

Hey there! Thanks for the PR, I have some follow up questions.

1. Did you consider any alternative solution over the custom marshaller? (e.g. using a blank interface?)
2. Could you please add some test cases for the new function?
3. Could you have a look and fix the linter errors?

Once again, thanks for the contribution.

[MarcoWel]

1. Nope - feel free to use an alternative solution.
2. The solution was tested against production data. You can check an example from the issue and add it to the test data.
3. Not sure what the linter issue should be - it works here without errors.

Running [/home/runner/golangci-lint-1.52.2-linux-amd64/golangci-lint run --out-format=github-actions] in [] ...
  Error: return with no blank line before (nlreturn)
  Error: return statements should not be cuddled if block has more than two lines (wsl)
  
  level=warning msg="[runner] Can't process result by diff processor: can't prepare diff by revgrep: could not read git repo: error executing git diff HEAD~: exit status 128"
  
  Error: golangci-lint exit with code 2

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This issue has been automatically closed because it has not had any activity after being labeled as staled.

[VictorAvelar]

Fixed on #328