WenjieShao

Session Persist Need for EME feature

1

### Is your feature request related to a problem? Please describe. Recently we are trying to cache the `keysession` and avoid the repeated request of license URL. We found it...

`internal-error` in `keystatuseschange` is not handled well

1

### What version of Hls.js are you using? 1.5.7 ### What browser (including version) are you using? Chrome 119.0.6045.199 ### What OS (including version) are you using? Mac OS 13.6...