Add MySQL OTel receiver config

[nenadnoveljic]

What does this PR do? What is the motivation?

Add MySQL OTel receiver config.

Merge instructions

Merge readiness:

• [ ] Ready for merge

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Additional notes

[github-actions[bot]]

✅ Documentation Team Review

The documentation team has approved this pull request. Thank you for your contribution!

[github-actions[bot]]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/nenadnoveljic/otel-mysql-collector-config/opentelemetry/integrations/mysql_metrics

[jhgilbert]

@nenadnoveljic, did you still want this update? Thanks!

[nenadnoveljic]

@nenadnoveljic, did you still want this update? Thanks!

yes but waiting on dev work to finish