Fizz supports aborting the render but does not currently accept a reason. The various render functions that use Fizz have some automatic and some user-controlled abort semantics that can be useful to communicate with the running program and users about why an Abort happened.

This change implements abort reasons for renderToReadableStream and renderToPipeable stream as well as legacy renderers such as renderToString and related implementations.

For AbortController implementations the reason passed to the abort method is forwarded to Fizz and sent to the onError handler. If no reason is provided the AbortController should construct an AbortError DOMException and as a fallback Fizz will generate a similar error in the absence of a reason

For pipeable streams, an abort function is returned alongside pipe which already accepted a reason. That reason is now forwarded to Fizz and the implementation described above.

For legacy renderers there is no exposed abort functionality but it is used internally and the reasons provided give useful context to, for instance to the fact that Suspense is not supported in renderToString-like renderers

Some notable special case reasons are included below
If no reason is provided then a manufactured reason "signal is aborted without reason"
If a writable stream errors then a reason "The destination stream errored while writing data."
If a writable stream closes early then a reason "The destination stream closed early."