Add trap coredump generation to wasmi

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What this task asks for

Generate opt-in Wasm coredumps on traps and attach the bytes to errors. Add opt-in coredump generation to wasmi. When enabled and a Wasm trap occurs, the error should carry a coredump. The coredump bytes are accessible from the error via a `coredump()` method that returns `Option<&[u8]>`. Each local's value is encoded according to its declared type, so the type of every local must be known at coredump generation time. Note that re-entrant Wasm calls may execute on separate stacks, so the coredump must still include frames from every level. Any coredump data from an inner invocation must be extended with outer frames, not replaced or left unchanged.