Some more Solana changes from Jacob & Colin.

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Proposal
- SIMD 15: https://github.com/solana-foundation/solana-improvement-documents/pull/15/files

Commit highlight
- Cost Tracking Updates: https://github.com/solana-labs/solana/pull/30035

Resource
- Kaizen: https://github.com/solana-kaizen/kaizen
- Oxylana: https://github.com/cavemanloverboy/oxylana

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Solana Changelog - February 21, 2023 - Epoch Rewards V2, Ledger Versioned Transacitons, and Kaizen