autoinstrumentation + dd otel compat mode#55
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braintrust-java-agent/internal/src/main/java/dev/braintrust/agent/BraintrustAgent.java
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When datadog is running in otel mode, it hijacks otel tracer globals and replaces them with a dd shim. This PR re-enables trace reporting to braintrust by registering a datadog trace interceptor and sending a copy of all traces up to braintrust.
Likely, this will report a lot of uninteresting spans to braintrust, so we will also ship a flag to filter for only braintrust spans (in a separate fast-follow PR).