SIMD-0194: Deprecate Rent Exemption Threshold

SIMD-0194 (Deprecate Rent Exemption Threshold) is a Core Standard Solana Improvement Document by Dean Little (@deanmlittle), Leonardo Donatacci (@L0STE), febo (Anza); proposal status Activated.

Active on mainnet-beta since epoch 943; active on testnet since epoch 907; active on devnet since epoch 1023.

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• Feature gate: SIMD-0194: Deprecate rent exemption threshold

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