Allow Initialization of Plugin from WebAssembly.Module

[wikiwong]

This was done in the "legacy" browser SDK here: extism/extism@e1a5b01

It allows Extism to be used in a wider variety of contexts (such as Cloudflare workers)

[chrisdickinson]

This should be pretty straightforward:

• in src/interfaces.ts: Add a new ManifestWasmModule, patterned after the existing interfaces, then add it to the ManifestWasm union type.
• Somewhat trickier: changing the signature of toWasmModuleData in src/manifest.ts. Instead of stopping the resolution of manifest input at array buffers, it should use those arraybuffers to create modules via WebAssembly.compile.
  • This is "trickier" in the sense that you'll have to do some refactoring across the rest of the codebase to put this in place.
  • src/foreground-plugin.ts, src/background-plugin.ts, and src/worker.ts will need to be modified to accept WebAssembly.Module instances.