WIP POC for better perf with encode/decode/castings

[ItzNotABug]

Add single-pass document processor for faster reads by combining decode and casting into one pass instead of two, reducing overhead when reading documents. Enabled via DB_SINGLE_PASS_PROCESSOR env var with fallbacks for edge cases. Includes benchmarks to test via DB_SINGLE_PASS_PROCESSOR.

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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 optimize-encode-decode-casting

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[abnegate]

Can you update the description to explain a bit more about the change? From looking through I can't tell where the improvement comes from

Edit: just saw that we're doing casting/decode in a single loop instead of separately. IMO this solution is a bit overkill, we're adding 1.5K lines of code to reduce 2 loops to 1, I'm not opposed to tightening the looping, but I think it could be a lot simpler