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.

crates/explorer/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "wasmtime-explorer"
+authors.workspace = true
+description = "Compiler explorer for Wasmtime and Cranelift"
+documentation = "https://docs.rs/wasmtime-explorer/"
+edition.workspace = true
+license = "Apache-2.0 WITH LLVM-exception"
+repository = "https://github.com/bytecodealliance/wasmtime"
+version.workspace = true
+
+[dependencies]
+anyhow = { workspace = true }
+capstone = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+target-lexicon = { workspace = true }
+wasmprinter = { workspace = true }
+wasmtime = { workspace = true, features = ["cranelift"] }