Add wasm to wasm support

[dm4]

In https://github.com/WasmEdge/WasmEdge/issues/1877 mentioned we'd like to use some serialize/deserialize protocol to replace interface type. Here we want to use wasmedge-bindgen to achieve this.

Current wasmedge-bindgen could only work when using rust to call export function from wasm. We'd like to add wasm to wasm support to wasmedge-bindgen.

We might need:

• Handle import functions in wasm
  • Convert function signatures for extern functions
  • Allocate/deallocate memory before/after calling wasm

[dm4]

replace this issue by https://github.com/WasmEdge/WasmEdge/issues/1981