Add helper for formatting ledger sequence and timestamp together in structured log fields

[Chucks1093]

Summary

Many log entries include both a ledger sequence number and a timestamp. These two fields are currently formatted inconsistently across different log sites. A shared helper that produces a standard log-friendly object for the ledger context should be used everywhere both fields appear together.

Scope

• Add ledgerLogContext(ledger: number, timestamp: Date): { ledger_sequence: number, ledger_timestamp: string } helper
• Timestamp formatted as ISO 8601 UTC string
• Add unit tests for: known ledger and timestamp produces expected output, timestamp is UTC not local time

Acceptance Criteria

• Output contains ledger_sequence and ledger_timestamp fields
• Timestamp is ISO 8601 UTC format
• Unit tests confirm both fields

ETA: 12 hours

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Coordinate on Telegram

[Oluwasuyi-Timilehin]

@Oluwasuyi-Timilehin has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello, please assign this to me. I would get started immediately

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[parkerwinner]

@parkerwinner has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi, am familiar with server issues and can resolve this issue robustly, kindly assign it to me

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