This change adds a basic coredump generation after a WebAssembly trap was entered. The coredump includes rudimentary stack / process debugging information. A new CLI argument is added to enable coredump generation: ``` wasmtime --coredump-on-trap=/path/to/coredump/file module.wasm ``` See ./docs/examples-coredump.md for a working example. Refs https://github.com/bytecodealliance/wasmtime/issues/5732