feat(minor-ampd): stellar verifier set verifier

[haiyizxx]

Description

AXE-4640

Todos

• [ ] Unit tests
• [ ] Manual tests
• [ ] Documentation
• [ ] Connect epics/issues

Steps to Test

Expected Behaviour

Other Notes

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 91.86603% with 34 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@0da965d). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
ampd/src/lib.rs	0.00%	14 Missing :warning:
ampd/src/stellar/http_client.rs	0.00%	11 Missing :warning:
ampd/src/handlers/stellar_verify_verifier_set.rs	97.94%	4 Missing :warning:
ampd/src/stellar/verifier.rs	98.24%	3 Missing :warning:
ampd/src/handlers/config.rs	85.71%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #617 +/- ## ======================================= Coverage ? 93.66% ======================================= Files ? 234 Lines ? 33322 Branches ? 0 ======================================= Hits ? 31210 Misses ? 2112 Partials ? 0 ```

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