SIMD-0306: Increase writeable account limit to 20M CUs

SIMD-0306 (Increase writeable account limit to 20M CUs) is a Core Standard Solana Improvement Document by Brennan Watt (Anza); proposal status Activated.

Active on mainnet-beta since epoch 878; active on testnet since epoch 865; active on devnet since epoch 949.

Feature gates

• Feature gate: SIMD-0306: Raise account CU limit to 40% max

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