Periodic air builder #42
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Add support for periodic columns - columns whose values repeat with a period dividing the trace length. These are useful for selectors and other repeating patterns in AIR constraints. Changes: - Add `periodic_table()` method to `BaseAir` trait - Add `PeriodicAirBuilder` trait extending `AirBuilder` with: - `PeriodicVar: Into<Expr>` - base field for prover, extension for verifier - `periodic_values()` - returns evaluations at current row - Add `periodic_values` field to `ProverConstraintFolder` (PackedVal) and `VerifierConstraintFolder` (Challenge) - Add `PeriodicAirBuilder` impl to `SymbolicAirBuilder` - Add `Entry::Periodic` variant to `SymbolicVariable` - Add `PeriodicAirBuilder` impl to lookup folder wrappers - Initialize with empty vec in uni-stark and batch-stark for now
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