HF TODOs

[wemeetagain]

With HF code safely namespaced and #1862 merged, we can incrementally (and safely) add HF support to master.

Some items RE forking that are left TODO (Somewhat in dependency order)

• RE state transition library
  • Finish naive lightclient state transition (Lightclient epoch processing #2045)
  • Add fast lightclient state transition (will require slightly extending fast utils)
  • Integrate lightclient spec tests
  • Create top-level naive + fast state transition (something that works for all forks)
• RE lodestar + validator
  • Replace relevant phase0 interface input/output with allForks types
  • Replace relevant ssz types with getType (Use config.getTypes where applicable #2075)
  • Use multi-bucket db repositories + create any additional (they exist, not currently in use)
  • Replace phase0 state transition w 'top-level' fast state transition
  • Update validator interaction (block/attestation/etc production) + validator side
  • Add gossip validation + handlers for lightclient fork
• RE whole project
  • Once the lightclient patch HF gets a name, we might find/replace lightclient/Lightclient throughout the project and rename.

Originally posted by @wemeetagain in #1862 (comment)

[dapplion]

Part of #2388

[stale]

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[dapplion]

Completed