fix: add AbortSignal to waitFor() and send trailer on stream abort#636

LautaroPetaccio wants to merge 4 commits intolivekit:mainlivekit/node-sdks:mainfrom

LautaroPetaccio:fix/waitfor-abort-signal-and-stream-abort-trailerLautaroPetaccio/node-sdks:fix/waitfor-abort-signal-and-stream-abort-trailerCopy head branch name to clipboard