Enable ZK ElGamal Proof program

Active on mainnet-beta (epoch 731), testnet (epoch 714) and devnet (epoch 801).

Minimum versions: Agave v2.0.0.

Introduced in anza-xyz/agave PR #1679.

Feature id zkhiy5oLowR7HY4zogXjCjeMXyruLqBwSWH21qcFtnv.

Related

Vortex