feat: fixProducerAPI

[eKuG]

Summary

Related Issues / PR's

https://github.com/SigNoz/engineering-pod/issues/2002

Screenshots

NA

Affected Areas and Manually Tested Areas

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[!IMPORTANT] Switch getProducerThroughputOverview to use List instead of Series and update related query functions.

• Behavior:
  • Modify getProducerThroughputOverview in http_handler.go to use List instead of Series for data handling.
  • Update latencyColumn to use List instead of Series.
  • Adjust data access to use pointers for service_name and topic.
• Query Building:
  • Change PanelType from Table to List in BuildQRParamsWithCache and buildCompositeQuery in translator.go for specific contexts.
  • Add support for producer-throughput-overview-latency in buildCompositeQuery.
• Misc:
  • Minor refactoring in http_handler.go to align with new data structure.

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