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Part of #8130, [RFC: Direct IO For Pageserver](https://github.com/neondatabase/neon/blob/problame/direct-io-rfc/docs/rfcs/034-direct-io-for-pageserver.md) ## Description Add pageserver config for evaluating/enabling direct I/O. - Disabled: current default, uses buffered io as is. - Evaluate: still uses buffered io, but could do alignment checking and perf simulation (pad latency by direct io RW to a fake file). - Enabled: uses direct io, behavior on alignment error is configurable. Signed-off-by: Yuchen Liang <yuchen@neon.tech>