Add spec references, a mapping of spec to implementation #8549
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Proposed Changes
This PR adds a directory with specification references. These are used to map specification items (configs, presets, functions, etc) to client implementations (code in Lighthouse). This is much less invasive than my original idea of adding spec tags all across the codebase. These specification references are meant to (1) help developers keep track of specification changes and (2) make it easier for third-parties (eg EF Protocol Security) to verify clients adhere to the specifications.
Additional Info
Our team is working to do this for all clients.
PS: The "check specrefs" action is expected to fail until Lighthouse updates to consensus-specs v1.6.1.