Explore runtime linking of JS provider

[bhelx]

This project is based on an older, but simpler way of building a js toolchain. We are statically compiling everything we need into one wasm file though a series of steps.

When javy switched hands to the bytecode alliance, they moved to a model of linking at runtime. Switching to this model could provide us some benefits. We've already effectively created a poor-man's linker to get exports to work. Supporting host functions would take us deeper down that path. So we either need to make use of a compile time linker or leverage wasmtimes runtime linker. We need some more research before we make a decision. One concern would be supporting other non-wasmtime runtimes. Will it work?