Introduce the wasmtime-explorer crate (#5975)

This implements Godbolt Compiler Explorer-like functionality for Wasmtime and
Cranelift. Given a Wasm module, it compiles the module to native code and then
writes a standalone HTML file that gives a split pane view between the WAT and
ASM disassemblies.

scripts/publish.rs

@@ -70,6 +70,7 @@ const CRATES_TO_PUBLISH: &[&str] = &[
     "wasmtime-wasi-threads",
     "wasmtime-wast",
     "wasmtime-cli-flags",
+    "wasmtime-explorer",
     "wasmtime-cli",
 ];