Add Duplicate Grant Detection

[Abd-Standard]

Description:
Implement logic to detect potentially duplicated grant entries based on similar titles, organizations, URLs, or other relevant metadata.

Acceptance Criteria:

Potential duplicates are flagged.
Existing records are not automatically deleted.
Administrators can review flagged entries.

[Osuochasam]

Dear maintainer please assign this issue to me

[grantfox-oss]

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

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #154)
2. Your PR will be reviewed by the Core-Foundry maintainers

Good luck! Track your progress on GrantFox.