Integrate wasm transform with schema registry

[vuldin]

The wasm transform should pull schemas from the registry. One issue is that wasm security is in place that blocks network connecitvity. A solution is to use a build tool to pull schemas from the registry at build time and bundle this into the script that gets sent to the wasm engine.

One solution is implemented in this branch. Once this PR is merged then the code in the integrate-registry-into-wasm branch will make it into a subsequent PR.