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As identified by a researcher during the Fusaka security competition, we were computing the proposer index incorrectly in some places by computing without lookahead. - [x] Add "low level" checks to computation functions in `consensus/types` to ensure they error cleanly - [x] Re-work the determination of proposer shuffling decision roots, which are now fork aware. - [x] Re-work and simplify the beacon proposer cache to be fork-aware. - [x] Optimise `with_proposer_cache` to use `OnceCell`. - [x] All tests passing. - [x] Resolve all remaining `FIXME(sproul)`s. - [x] Unit tests for `ProtoBlock::proposer_shuffling_root_for_child_block`. - [x] End-to-end regression test. - [x] Test on pre-Fulu network. - [x] Test on post-Fulu network. Co-Authored-By: Michael Sproul <michael@sigmaprime.io>