feat(builder): observe beacon node blocks - #9931

feat(builder): observe beacon node blocks#9931

krisoshea-eth wants to merge 20 commits into

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krisoshea-eth:krisoshea/lod-12-api-02-consume-bn-block-events-and-retrieve-fork-correctkrisoshea-eth/lodestar:krisoshea/lod-12-api-02-consume-bn-block-events-and-retrieve-fork-correctCopy head branch name to clipboard