Use latest block header + slot as skip slot cache key #8443
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What type of PR is this?
What does this PR do? Why is it needed?
Having to HTR for beacon state for skip slot cache key is inefficient. See flame graphs:
During initial sync
Regular run time
After they no longer appear in the flame graphs
Instead we can do better by HTR the latest block header and hash it with current state slot. This should be much nicer to the memory and CPU.
Which issues(s) does this PR fix?
N/A
Other notes for review
N/A