Experiment with a proxy for solving JSON.stringify issue

[dprokop]

Just experimenting with an approach to solve scopedVars JSON.stringify issue upstream. Publishing this only to get a canary release out to test in core.

fyi @kaydelaney @torkelo @joshhunt @ivanortegaalba

📦 Published PR as canary version: 5.3.9--canary.824.9873640037.0

:sparkles: Test out this PR locally via: ```bash npm install @grafana/scenes-react@5.3.9--canary.824.9873640037.0 npm install @grafana/scenes@5.3.9--canary.824.9873640037.0 # or yarn add @grafana/scenes-react@5.3.9--canary.824.9873640037.0 yarn add @grafana/scenes@5.3.9--canary.824.9873640037.0 ```

[dprokop]

Closing in favor of #828