chore: add experimental rate/increase calc

[srikanthccv]

Summary

Experimenting with expressions used to calculate rate/increase for cumulative counters. This is better than what is already there for cases where the aggregation is performed for the whole window, but I want to see how it works in all scenarios.

---

[!IMPORTANT] Adds experimental rate/increase calculations in timeseries.go, conditionally used based on environment variables.

• Behavior:
  • Adds experimentalRateWithoutNegative and experimentalIncreaseWithoutNegative expressions in timeseries.go for rate and increase calculations.
  • Uses experimental expressions if EXPERIMENTAL_RATE_WITHOUT_NEGATIVE or EXPERIMENTAL_INCREASE_WITHOUT_NEGATIVE environment variables are set.
• Functions:
  • Modifies prepareTimeAggregationSubQuery to conditionally use experimental expressions based on environment variables.

^{This description was created by for 14dbe5d96afa5a07ff24077d5f74cdb34c724a94. It will automatically update as commits are pushed.}

[github-actions[bot]]

Build Error! No Linked Issue found. Please link an issue or mention it in the body using #

[github-actions[bot]]

Build Error! No Linked Issue found. Please link an issue or mention it in the body using #