Generate arbitrary struct and array types based on
the fuzzer random input stream.
They replace the hard-coded types.
Generated types include nested reference types and recursive types.

Bug: v8:11954
Change-Id: I2e40697f2ace3eb818360213e8a4dd40037e580e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3173683
Commit-Queue: Maria Tîmbur <mtimbur@google.com>
Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77010}