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* Fulu: Implement params. * KZG tests: Re-implement `getRandBlob` to avoid tests cyclical dependencies. Not ideal, but any better idea welcome. * Fulu testing util: Implement `GenerateCellsAndProofs`. * Create `RODataColumn`. * Implement `MerkleProofKZGCommitments`. * Export `leavesFromCommitments`. * Implement peerDAS core. * Add changelog. * Update beacon-chain/core/peerdas/das_core.go Co-authored-by: terence <terence@prysmaticlabs.com> * Fix Terence's comment: Use `IsNil`. * Fix Terence's comment: Avoid useless `filteredIndices`. * Fix Terence's comment: Simplify odd/even cases. * Fix Terence's comment: Use `IsNil`. * Spectests: Add Fulu networking * Fix Terence's comment: `CustodyGroups`: Stick to the spec by returning a (sorted) slice. * Fix Terence's comment: `CustodyGroups`: Handle correctly the `maxUint256` case. * Update beacon-chain/core/peerdas/das_core.go Co-authored-by: terence <terence@prysmaticlabs.com> * Fix Terence's comment: `ComputeColumnsForCustodyGroup`: Add test if `custodyGroup == numberOfCustodyGroup` * `CustodyGroups`: Test if `custodyGroupCount > numberOfCustodyGroup`. * `CustodyGroups`: Add a shortcut if all custody groups are needed. * `ComputeCystodyGroupForColumn`: Move from `p2p_interface.go` to `das_core.go`. * Fix Terence's comment: Fix `ComputeCustodyGroupForColumn`. * Fix Terence's comment: Remove `constructCellsAndProofs` function. * Fix Terence's comment: `ValidatorsCustodyRequirement`: Use effective balance instead of balance. * `MerkleProofKZGCommitments`: Add tests * Remove peer sampling. * `DataColumnSidecars`: Add missing tests. * Fix Jame's comment. * Fix James' comment. * Fix James' comment. * Fix James' coment. * Fix James' comment. --------- Co-authored-by: terence <terence@prysmaticlabs.com>