[whatwg/streams] writeSync function on WritableStreamDefaultWriter to avoid unnecessary heap allocations from Promises returned by write (Issue #1276)

I have an xlsx export process where many writes occur. The exports previously used nodejs's `Writable` the `write` method is synchronous. I converted the streaming over to `WritableStream`. This resulted in a `FATAL ERROR: Reached heap limit Allocation failed`.

Since Promises create heap allocations & apps that use many fire & forget writes to a `WritableStreamDefaultWriter` do not benefit from Promises, it would be more memory efficient to have a synchronous function, such as `writeSync`.

One could await the promises or write to a buffer & queue the writes, but that would complicate & slow down the program. With nodejs's `Writable`, the program can be synchronous. Is this use case something to be considered for Web API streams?

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