Please implement the directly call funcref from guest table feature

[rsta79]

Motivation

I'm building plugin system for my rust app using wasmer crate, and I need to call funcref from guest table in host directly without calling call_callback function from guest

Proposed solution

This feature is implemented in wasmtime crate (https://github.com/bytecodealliance/wasmtime)

Additional context

Note: error message when i try to call funcref from guest table directly

thread 'main' panicked at 'not implemented: Native function definitions can't be directly called from the host yet', MY_CARGO_PATH\wasmer-2.2.1\src\sys\externals\function.rs:540:17
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace