Add logging for `streaming` state changes and `streamingAllowed` timer and information for when appendBuffer is called based in streaming state.
rdar://116158344
Pull request: https://github.com/WebKit/WebKit/pull/18460
Committed 268701@main (9b0f88f8f8dd): <https://commits.webkit.org/268701@main> Reviewed commits have been landed. Closing PR #18460 and removing active labels.