Ensure all primitive types are mapped properly

[bengreenier]

Currently, a best-effort set of primitives is mapped in tsgen/resolve.ts. However, we should ensure that the list covers all types that ref.types knows how to represent, which should, by extension, be all valid primitive types.

If you're reading this issue, it might be because a type is missing. To debug, use set DEBUG=clangffi:tsgen:resolve and look for your type. The output should make it clear if it was resolved as a "builtin" or "unknown" type. If you believe it to be a primitive but it's showing up as "unknown", we need to add it to these lookup tables.