mgr/dashboard: add graphs to rgw overview dashboard

[aaSharma14]

Fixes: https://tracker.ceph.com/issues/62317

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[github-actions]

This pull request can no longer be automatically merged: a rebase is needed and changes have to be manually resolved

[epuertat]

Instead of this chart layout, why not sticking to the new Dashboard v3 Utilization charts style? We already added a new Dashboard pattern, so why not leveraging that style rather than reinventing a new one?

[cloudbehl]

jenkins test make check

[cloudbehl]

I did some testing around the PR and here are my findings.

I created 20 buckets in default placement and added some data into them.

• Objects data when no bucket should be set to 0 objects rather than not showing it.
• Should we just consider the data pool for calculating the avg object size. As in my case, the avg size of object was 12KiB but from our calculation its coming 8.6Kib due to consideration of non-data pools like logs, meta ,control and otp.

Visually:
The padding is not consistent between Inventory and Performance stats and performance stats and Used capacity/Avg object size. Double padding on 1rem done on Used capacity/Avg object size cards.

Screencast.from.2023-07-31.14-44-23.webm

[cloudbehl]

jenkins test make check

[cloudbehl]

Thanks Aashish, great work!

[nizamial09]

lgtm! thank you @aaSharma14