Ability to redirect logs to a java callback

I have a user who I've diagnosed to have object-box-related issues. I can send him debug builds with the ObjectBox debug flags (debugFlags(), debugRelations(), etc...) turned on. However, I would like to redirect the object box logs to a callback where I can collect all the ObjectBox logs and save them to a file for later processing.

Edit: Original discussion at https://stackoverflow.com/q/64616858/9187282

该 issue 将 debugFlags() 和 debugRelations() 列为现有的入口点；首先跟踪这些 Java 调试选项如何输出 ObjectBox 日志。完成标准是 Java 回调可以接收这些日志，以便将其收集到文件中，并根据现有的日志记录流程验证其行为。