fix: format wasm stack traces per W3C spec (#32246)
## Summary
- Update wasm stack trace formatting to use the W3C WebAssembly Web API
spec format: `wasm-function[<funcIndex>]:0x<hexOffset>` instead of the
generic `line:col` format
- Update existing `wasm_url` test expectation to match
- Add new integration test (`wasm_stack_trace`) covering:
- Basic unreachable trap with correct `wasm-function[0]:0x<offset>`
format
- Multi-frame wasm call chain verifying correct function indices across
frames
- `Error.prepareStackTrace` callsite `toString()` producing correct wasm
format
Fixes #32239
Actually fixed in https://github.com/denoland/deno/pull/32293, this just
adds a test.
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
