support webassembly

It might be possible to support webassembly via the `__stack_pointer` global, perhaps we can read it before and after executing the function code. I'm not sure how well that will work but it could be worth a try.

Start by reading the crate's existing function-instrumentation and stack-measurement paths, then investigate how WebAssembly exposes the `__stack_pointer` global before and after function execution. Done means the crate can measure and report stack sizes for supported WebAssembly functions, with behavior verified by relevant tests.

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