fix: prevent glog crash on concurrent initialization

[lxy-9602]

Purpose

Fix crash in multi-threaded FileStoreWrite::Create due to unsafe glog initialization.

google::InitGoogleLogging() is not thread-safe and must be called only once in a single-threaded context. However, when multiple threads concurrently call FileStoreWrite::Create, they may trigger InitGoogleLogging() simultaneously, leading to undefined behavior and occasional core dumps.

This PR fixes the issue by locking for ensuring it is executed exactly once—even under heavy concurrency.

Tests

logging_test.cpp

API and Format

Documentation

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