Conformance tests

[brson]

Add tests that the binaryen wasm-opt, rust wasm-opt CLI, and Command-based API all produce the same results. The output module and sourcemap should be checked that they are binary identical.

Some tests we need:

• input wasm, output wasm, no optimization args
• input wasm, output wasm, -Os, -Oz, -O0,1,2,3,4
• input wasm, output wat
• input wat, output wasm
• input wasm, output wat, no opt args
• input wasm, output wat, -Os
• input wat, output wasm, no opt args
• input wat, output wasm, -Os
• input wasm with sourcemap, output wasm without sourcemap, -Os
• input wasm with sourcemap, output wasm with sourcemap, -Os
• -O0 plus the inlining-with-opts pass
• -g (used by cargo-contract)
• -zero-filled-memory (used by cargo-contract)

[Aimeedeer]

done