Add IDs to all observability signals

[epinzur]

Add unique IDs to all observability signals, created at event emission time.

Spans already have unique IDs (traceId + spanId)

But we should create unique IDs for each log, metric, score, feedback, etc..

LogId would ideally use the same format as logId in otel...if a standard exists.

Others can be just uuids.

Primary use case today is use as a de-duplication key in our OLAP stores, but also can help with linking signals to other systems.

[daneatmastra]

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