[wasm] BrowserHttpHandler to support large/streaming requests via ReadableStream

[pavelsavara]

Currently PostAsync_CancelDuringRequestContentSend_TaskCanceledQuickly test fails with OutOfMemoryException

We should instead allow streaming requests

const stream = new ReadableStream({
  async start(controller) {
    await wait(1000);
    controller.enqueue('This ');
    await wait(1000);
    controller.enqueue('is ');
    await wait(1000);
    controller.enqueue('a ');
    await wait(1000);
    controller.enqueue('slow ');
    await wait(1000);
    controller.enqueue('request.');
    controller.close();
  },
}).pipeThrough(new TextEncoderStream());

fetch(url, {
  method: 'POST',
  headers: { 'Content-Type': 'text/plain' },
  body: stream,
});

See https://web.dev/fetch-upload-streaming/

[ghost]

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Issue Details

---

Currently PostAsync_CancelDuringRequestContentSend_TaskCanceledQuickly test fails with OutOfMemoryException

We should instead allow streaming requests

const stream = new ReadableStream({
  async start(controller) {
    await wait(1000);
    controller.enqueue('This ');
    await wait(1000);
    controller.enqueue('is ');
    await wait(1000);
    controller.enqueue('a ');
    await wait(1000);
    controller.enqueue('slow ');
    await wait(1000);
    controller.enqueue('request.');
    controller.close();
  },
}).pipeThrough(new TextEncoderStream());

fetch(url, {
  method: 'POST',
  headers: { 'Content-Type': 'text/plain' },
  body: stream,
});

See https://web.dev/fetch-upload-streaming/

Author:	pavelsavara
Assignees:	-
Labels:	arch-wasm, area-System.Net.Http
Milestone:	7.0.0

[campersau]

Might be a duplicate of #36634 ?