Improvement: invoke and wait for recorder.requestData when closing stream

[lorikku]

Right now whenever you stream.destroy, there is a chance that there is still a Blob forming if your frameSize was set to a high number eg. 120s. But this is not checked or accounted for, meaning that stream.destroy invocation would essentially get rid of that last <120s that was still in memory.

Calling recorder.requestData() before closing everything (stream/recorder/ws) and awaiting it somehow would be the fix for this, but at this point the way closing or finishing the whole chain of everything works is very hacky and not async at all, surviving on setTimeouts, which is a very no-no.

Will have to look into this in the future.