Wasmi specific Wast Tests

This repo contains some Wast tests from the official Wasm spec testsuite that have been modified to work with Wasmi.

In particular this repository contains the following subsets of the official Wasm spec testsuite:

1. proposals/memory64
   • This has been modified to remove references from Wasm proposals unsupported by Wasmi such as the exceptions and function-references proposal.
   • At the time of writing this the Wasm spec testsuite is about to be moved over to Wasm 3.0 while Wasmi does not even support all of Wasm 2.0. Therefore, for a subset of the Wasm spec testsuite features we rely on this fork to provide the proper tests that can be consumed by Wasmi.