feat(anthropic): add prompt cache ttl metrics#344
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Surface Anthropic cache_creation TTL buckets as Braintrust span metrics for 5m and 1h prompt-cache writes while preserving the aggregate cache creation total for legacy cost paths. Add focused VCR-backed coverage for both default 5m caching and the extended 1h beta header.
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Surface Anthropic cache_creation TTL buckets as Braintrust span metrics for 5m and 1h prompt-cache writes while preserving the aggregate cache creation total for legacy cost paths.
Add focused VCR-backed coverage for both default 5m caching and the extended 1h beta header.
ref braintrustdata/braintrust-spec#13
dependent on https://github.com/braintrustdata/braintrust/pull/12968 being merged