fix tickSafeMode bug, change some apis to allow users to customize

[Iamclinkz]

Recently, I've been working on a project that utilizes your time-wheel timer, and I must say it works exceptionally well and efficiently. In particular, I'm very impressed with the TickSafeMode feature - it's a brilliant idea. However, during the course of using it, I've come across a few minor bugs related to TickSafeMode, and sometimes I need the remove function to return a meaningful value when dealing with potentially timeout-prone asynchronous transactions. Additionally, I believe it would be beneficial to allow users to customize the buffer size for TickSafeMode.

I have made some modifications to address these issues and updated the tests accordingly. I would greatly appreciate it if you could take a look at my changes and provide any feedback or suggestions.