Consider AssemblyScript compatible host bindings

[rajsite]

Would be nice to have a host binding interface that was similar to / compatible with AssemblyScript host binding to be able to pick-up some of the things they have done like:

• wasi-preview-1 bindings
• wasm4 support (wasm4 is the thing I really want to play with using porffor :P)
• much more speculative but the discussions of wasip2-module format would probably be compatible with the same interface. More context on wasip2-module concept. More discussion from the wamr folks.