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

.github/workflows/main.yml

@@ -181,7 +181,7 @@ jobs:
         toolchain: nightly-2021-12-15
     - run: cargo install cargo-fuzz --vers "^0.11"
     # Install OCaml packages necessary for 'differential_spec' fuzz target.
-    - run: sudo apt install -y ocaml-nox ocamlbuild
+    - run: sudo apt install -y ocaml-nox ocamlbuild ocaml-findlib libzarith-ocaml-dev
     - run: cargo fetch
       working-directory: ./fuzz
     - run: cargo fuzz build --dev