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hbm-minigbm: ensure logger always has valid callback

Ryan Neph requested to merge ryanneph/hbm:rn-capi-logger into main

use LazyLock to ensure the LoggerState always contains a valid callback (even if it is just a stub). Then we can avoid using an Option and unwrapping it when we expect it to be Some() at all times.

Still need the Once to do one-time-only logger registration.

Adds log file buffering + flush() implementation

Adds unit test for basic logging behavior and log level filtering.

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