Differentiate between `waiting` and `stalled` events in adapters

[opticSquid]

Here's the difference between the waiting and stalled events:

waiting Event

• Fires when playback has stopped because the next frame is not available yet
• Occurs during active playback when the video runs out of buffered data
• The video was playing but had to pause because it needs to buffer more data
• Common scenario: Video is playing, user has a slow connection, and playback catches up to the buffer

Example: You're watching a video, it's playing smoothly, then it suddenly pauses with a loading spinner - that's when waiting fires.

stalled Event

• Fires when the browser is trying to fetch media data but data is unexpectedly not forthcoming
• Occurs during the loading/buffering phase when data stops arriving
• The browser expected data to arrive but it's not coming through
• Common scenario: Network issues, server problems, or connection interruptions while downloading

Example: You start loading a video, the download progress bar stops moving because the server stopped sending data - that's when stalled fires.