fix(metrics): use clearInterval instead of clearTimeout in stop() #246
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About the changes
When using unleash-proxy-client on the server side (e.g., for SSR or per-request flag fetching), we observed increasing memory usage and event loop handles even though .stop() was called immediately after .start().
After investigation, the issue was resolved by setting disableMetrics: true, suggesting that .stop () does not properly clean up background metrics collection.
Closes #245