[don't merge] just for review

[feiyang3cat]

What changed?

1. Removed obsolete fields — safe to delete as this feature has not been released (disable compatibility checking temporarily)
2. Removed maxElapsedDuration — considered redundant given overlapping functionality
3. Added delta to maxSkippedDuration, changed its structure, exposed current max skip duration and remaining duration in the time-skipping transitioned event

Why?

1. for 1) and 2), make the API cleaner
2. for 2) and 3), simplify user experience

• maxElapsed and maxSkip serve similar purposes functionally; maxSkip is the simpler model since it only accounts for skipped duration
• delta is introduced so users don't need to track cumulative skipped duration themselves
• Current max skip info is surfaced in the time-skipping event for better observability

Breaking changes

1. removed the feature maxElapsedDuration -> the server has already implemented this feature
2. restructured the maxSkippedDuration-> the server has used the old data structure for its implementation

Server PR
TBD if the change in the PR is good option and no better option can be found