Add Verification Decision Batch Getter

[Naomi-Gift]

Indexers may need to fetch many verification records efficiently by project ID or request ID.
Acceptance criteria:
Add batch getter for verification records.
Enforce max batch size.
Missing records are skipped or returned as None according to documented behavior.
Tests cover mixed existing/missing records.

[Trusty08]

@Trusty08 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi, i'd love to work on this issue. I've gone through the requirement and can fix the issue please assign it to me. Thank you.

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[drips-wave]

Congratulations, @Trusty08! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @Trusty08: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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[grantfox-oss]

🦊 GrantFox — @Trusty08 has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #229)
2. Your PR will be reviewed by the HubDApp maintainers

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