Cody completions: Improve completions logger and fix cache retrieval bug #52695
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Fixes #52585
Fixes #52583
This PR mainly focuses on improving the logging setup so that we can measure how long a completion was visible. We also include a special "read" flag that is only set if the completion is visible for at least 750ms.
Since this PR required me to refactor the cache to store some metadata with the completions (specifically I wanted to store a unique ID that we can use to connect various completion events), I could also extend this to fix #52585 quickly.
Test plan