[Minor change] Add aggregate attribute to client scope model

[vikram-deepfactor]

Thanks for your contribution! Hi, if there is an issue, that your PR adresses, please link it!

• Added field aggregate.attrs to client scope, which supports aggregation of multiple values
• Tested locally

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (ba0216d) 77.26% compared to head (a13ebcb) 77.26%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #455 +/- ## ======================================= Coverage 77.26% 77.26% ======================================= Files 4 4 Lines 2261 2261 ======================================= Hits 1747 1747 Misses 345 345 Partials 169 169 ```

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[Nerzal]

LGTM, thank you !