add halo2_gadgets_optimized · QED-it/halo2@c496f0f

Build benchmarks: halo2_gadgets_optimized/benches/sha256.rs#L20

failed to resolve: use of undeclared crate or module `halo2_gadgets`

could not compile `halo2_gadgets_optimized` (bench "sha256") due to 1 previous error

The process '/home/runner/.cargo/bin/cargo' failed with exit code 101

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