Document OpenTelemetry drop-in support

[mcculls]

What does this PR do? What is the motivation?

Various language SDKs support adding OpenTelemetry instrumentations alongside their built-in instrumentations. This PR documents how to achieve that - initially for Java, but other languages will add their steps to this PR.

Merge instructions

• [ ] Please merge after reviewing
• [ ] Add instructions for other languages before merging

Additional notes

[github-actions[bot]]

Preview links (active after the build_preview check completes)

New or renamed files

• https://docs-staging.datadoghq.com/mcculls/otel-drop-in-support/opentelemetry/interoperability/instrumentation_libraries

Modified Files

• https://docs-staging.datadoghq.com/mcculls/otel-drop-in-support/opentelemetry/interoperability/
• https://docs-staging.datadoghq.com/mcculls/otel-drop-in-support/tracing/trace_collection/compatibility/java

[buraizu]

Thanks for the PR, I've created DOCS-8443 for documentation team review

[mcculls]

Thanks for the review @brett0000FF - is there anything else I need to do before this gets merged?

[datadog-datadog-prod-us1[bot]]

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