fix(otel): handle nested output attributes#10687

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When ingesting Otel spans, when using attribute properties to map input/outputs, nested values were lost.

This happens for instance for TraceLoop LLM outputs with tool calls:

gen_ai.completion.0.tool_calls.0.name

Astool_calls have nested data, beyond 2 levels, all those attributes were lost.

This PR adds logic to convert to nested objects.

Important

Fixes nested attribute handling in Otel spans by enhancingOtelIngestionProcessor to support nested arrays/objects.

Behavior:
- Fixes issue where nested Otel span attributes were lost beyond 2 levels inOtelIngestionProcessor.
- Adds logic toconvertKeyPathToNestedObject() to handle nested arrays/objects.
Functions:
- UpdatesprocessToEvent() andprocessToIngestionEvents() to utilize new nested object handling.
- ModifiesextractInputAndOutput() to support nested attribute extraction.
Misc:
- Adds handling for nested structures inconvertKeyPathToNestedObject() inOtelIngestionProcessor.ts.