feat: Optimise getRelayerStatus method

[zeljkoX]

Summary

This PR will:

• Optimise Stellar get status method by using internal transaction counter sequence number
• Optimise get status method by allowing conditionally fetching field (lower impact in high throughput systems)

Testing Process

Checklist

• Add a reference to related issues in the PR description.
• Add unit tests if applicable.

Note

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch optimise-relayer-status

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