Animator Optimization

[cptbtptpbcptdtptp]

• [x] The reset function of AnimatorStatePlayData did not reset clipTime.
• [x] Need to support the function of jumping to a certain frame. (goAndStop)
• [x] Timing problem of animation playback.(After loading, the default controller will be played, before onAwake)
• [x] Optimize the interface of addEvent.
• [x] FindPlayingStateByLayers.
• [x] Whether clipStartTime and clipEndTime should be normalized.
• [ ] If play-> crossFade ->crossFade-> play(), revert default value maybe omissions.