SIMD-0207: Raise Block Limits to 50M CUs

SIMD-0207 (Raise Block Limits to 50M CUs) is a Core Standard Solana Improvement Document by Andrew Fitzgerald (Anza); proposal status Activated.

Active on mainnet-beta since epoch 770; active on testnet since epoch 764; active on devnet since epoch 857.

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• Feature gate: SIMD-0207: Raise block limit to 50M

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