Introduce CloseOptions::prepare_close_fn to allow pre-Close callback function #13237
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Summary
This PR addresses a current limitation where users cannot call pre-close functions when utilizing the
WaitForCompact()API withoptions.close_db = true. By introducing CloseOptions to the Close() API, which will include a callback to be called before Closing the db, users can now execute custom code after waiting for compactions but before closing the db.Test Plan
Unit Test updated