[fuzzer][wasm] Add support for reftypes in test generator

We add support for struct and arraytypes in wasm-fuzzer-common.
Also, we add addStruct and addArray while generating tests.
Other OptRef types like eqref/anyref have been supported.
Adding struct and arraytypes in wasm-compile has been placed
at the beginning in order to generate them in addSignature.

Bug: v8:11954
Change-Id: Ibe468dd4df70ad40367196c88353b28b7654f086
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3074463


Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Commit-Queue: Rakhim Khismet <khismet@google.com>
Cr-Commit-Position: refs/heads/master@{#76137}