This CL introduces the SyncStreamingDecoder to support
streaming compilation when --single-threaded is set. The
SyncStreamingDecoder buffers all bytes it receives over
{OnBytesReceived}, and compiles them synchronously upon {Finish}.

In addition to introducing SyncStreamingDecoder, this CL does
the following changes:
* Redirect streaming compilation to the new streaming decoder if
  --no-wasm-async-compilation is set. This flag is set if
  --single-threaded is set.
* Extend the test-streaming-compilation.cc tests to test also the new
  streaming decoder.

R=thibaudm@chromium.org

Bug: v8:10548
Change-Id: I807e291a6060067c9835de4adf82bcb00321d995
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2209053
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67955}