Allow statically linking other WASM modules

[SpaceManiac]

It'd be useful to be able to write computation in Rust and compile it to WASM and somehow import that into Starstream modules.

[SpaceManiac]

Now a "maybe" feature because statically linking WASM modules is somewhat scuffed. Relevant partway-there tools:

• wasm-merge https://github.com/WebAssembly/binaryen/blob/f634373fb0d2ea84382de120c73a07622918f68e/src/tools/wasm-merge.cpp#L576-L588
• wasm-ld https://lld.llvm.org/WebAssembly.html

[SebastienGllmt]

It looks like WASM components are also trying to work on ways to compose multiple components together. It's obviously more restrictive than being able to combine arbitrary WASM files and doesn't feel mature, but it's something to keep an eye on at least