feat: add fetch_accounts xtask

[SwenSchaeferjohann]

• make it easy to copy accounts from a network and store as JSON
• solana checks last_extended_slot to be finalized which is a PIA if you want to use a mainnet LUT on localnet.
• --lut flag fixes this by setting last_extended_slot to 0
• --add-pubkeys lets you extend the LUT

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fetch-accounts

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