segregate sync committee messages by period / fork #4953
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`SyncCommitteeMsgPool` grouped messages by their `beacon_block_root`. This is problematic around sync committee period boundaries and forks. Around sync committee period boundaries, members from both the current and next sync committee may sign the same `beacon_block_root`; mixing the signatures from both committees together is a mistake. Likewise, around fork transitions, the `signing_root` changes, so those messages also need to be segregated.
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SyncCommitteeMsgPoolgrouped messages by theirbeacon_block_root. This is problematic around sync committee period boundaries and forks. Around sync committee period boundaries, members from both the current and next sync committee may sign the samebeacon_block_root; mixing the signatures from both committees together is a mistake. Likewise, around fork transitions, thesigning_rootchanges, so those messages also need to be segregated.