Support Non-WASI plug-ins about js-pdk HOT 1 OPEN

It seems like Extism is settling around some type of kernel with a consistent pattern for accessing memory locations for data passing. For the "getting code in" part, the underlying pdk could have a method that takes in a pointer to the memory where the code is, and have the rust wrapper call that method to load the code into memory for quickjs during the wizer step?

I know the newer versions of javy after this fork was started have the ability to externalize the provider quickjs as a separate module and I think they do memory passing to it currently to give it the bytecode, and not through wasi, but I could be misremembering that, it's been a while since I looked at it.

from js-pdk.