Add Rating Distribution

[Naomi-Gift]

Only average rating, count, and sum are stored. Frontends often need rating histogram distribution.
Acceptance criteria:
Store counts for each rating value 1-5.
Update distribution on add/update/delete review.
Add getter for rating distribution.
Tests cover all rating transitions.

[mrmoney10010-design]

@mrmoney10010-design has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi, I'd like to work on this issue.

I plan to extend the review statistics to track rating distributions for values 1–5, ensure the distribution is correctly updated on review creation, updates, and deletions, add a getter for retrieving the histogram data, and implement tests covering all rating transition scenarios.

Could this issue be assigned to me?

ℹ️ Repo Maintainers: To accept this application, review their application or assign @mrmoney10010-design to this issue.

[maztah1]

@maztah1 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Can i solve this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @maztah1 to this issue.

[orunganiekan]

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

i would like to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @orunganiekan to this issue.

[drips-wave]

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

🧑‍💻 @orunganiekan: 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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[drips-wave]

This issue has been completed by @orunganiekan as part of the Stellar Wave Program's 6th Wave 🥳

😎 @orunganiekan: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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