Cross-platform Profiling - Wasmtime

# Using Wasmtime's cross-platform profiler

The guest profiling strategy enables in-process sampling and will write the captured profile to a file which can be viewed at https://profiler.firefox.com/.

To use this profiler with the Wasmtime CLI, pass the `--profile=guest[,path[,interval]]` flag.

- `path` is where to write the profile, `wasmtime-guest-profile.json` by default
- `interval` is the duration between samples, 10ms by default

When used with `-W timeout=N`, the timeout will be rounded up to the nearest multiple of the profiling interval.