feat: Export Trino metrics to Prometheus and enable autoscalling with KEDA

[bbgu1]

What does this PR do?

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Scaling Trino workers with KEDA and metrics in Prometheus

Motivation

Enable Trino auto-scaling by tracking metrics such as cpu, memory pressure, and queued queries.

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Mandatory for new blueprints. Yes, I have added a example to support my blueprint PR
• Mandatory for new blueprints. Yes, I have updated the website/docs or website/blog section for this feature
• Yes, I ran pre-commit run -a with this PR. Link for installing pre-commit locally

For Moderators

• E2E Test successfully complete before merge?

Additional Notes

• using latest version of trino and trino helm chart
• enabled jmx exporter and servicemonitor to both coordinator and workers.
• deploying scaledobject for trino-worker in terraform

[ratnopamc]

Thanks for the PR @bbgu1.
Could you please update the website doc and add a section with the instructions to test the scaling with KEDA in action?

[ratnopamc]

Thanks for the PR @bbgu1. Could you please update the website doc and add a section with the instructions to test the scaling with KEDA in action?

@bbgu1 will raise a separate PR with documentation updates and load testing script.

[ratnopamc]

lgtm.