Fuzzing against verified fork of spec interpreter (#3843)

* Revert "Remove spec interpreter fuzz target temporarily (#3399)"

This reverts commit 25d3fa4d7b.

* add support for differential fuzzing against verified OCaml interpreter

* formatting

* comments

* fix missing dep case

* fix build error

* fix unit tests?

* restore previous differential_v8 max_table config

* attempt: add OCaml deps

* fix interpeter github repo

* fix spec repo url

* fix zarith package

* fix unit test

crates/fuzzing/Cargo.toml

@@ -35,8 +35,7 @@ v8 = "0.33"
 [dev-dependencies]
 wat = "1.0.37"
 
-# FIXME(#3251) should re-enable once spec interpreter won't time out
 # We only build the library containing the OCaml spec interpreter if the OCaml
 # toolchain is available--which is assumed here to be the case when fuzzing.
-# [target.'cfg(fuzzing)'.dependencies]
-# wasm-spec-interpreter = { path = "./wasm-spec-interpreter", features = ["build-libinterpret"] }
+[target.'cfg(fuzzing)'.dependencies]
+wasm-spec-interpreter = { path = "./wasm-spec-interpreter", features = ["build-libinterpret"] }