wit-parser: parse multiple packages and automatically resolve

[oovm]

The Resolve type doesn't seem to have a suitable function to resolve such a folder: https://github.com/WebAssembly/WASI/tree/main/preview2.

Directly parsing the directory of a single package will result in a type not found error.

Renaming it to deps can parse all packages but does not seem to be a reasonable use of this function.
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[alexcrichton]

That's correct, yeah, there's no native function to parse that. We'll work to make sure this is sorted out for the next release