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

fuzz/fuzz_targets/differential_v8.rs

@@ -20,6 +20,10 @@ fn run(data: &[u8]) -> Result<()> {
     config.module_config.config.bulk_memory_enabled = true;
     config.module_config.config.reference_types_enabled = true;
 
+    // Allow multiple tables, as set_differential_config() assumes reference
+    // types are disabled and therefore sets max_tables to 1
+    config.module_config.config.max_tables = 4;
+
     let module = config.generate(&mut u, Some(1000))?;
     oracles::differential_v8_execution(&module.to_bytes(), &config);
     Ok(())