Display human-friendly progress when starting wasmer run
#3985
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This fixes #3981 by adding some spinners during certain parts of the startup process.
I've mostly done this by creating a wrapper
wasmer_wasix::Runtime
implementation that will display progress bars during certain operations. Unfortunately, our current abstractions don't really expose the hooks we'd want for fine-grained progress updates like telling people how many bytes have been downloaded for a certain package, and some expensive operations (e.g. module compilation) aren't possible to hook into for reporting progress, but I guess it's better than nothing 🤷