is_raw_mode_enabled does not support wasip2

[oovm]

crossterm/src/terminal.rs

Lines 107 to 117 in 6d6d3cb

	pub fn is_raw_mode_enabled() -> io::Result<bool> {
	#[cfg(unix)]
	{
	Ok(sys::is_raw_mode_enabled())
	}
	#[cfg(windows)]
	{
	sys::is_raw_mode_enabled()
	}
	}

error[E0308]: mismatched types                                                                                                                                                                                                                                        
   --> C:\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\crossterm-0.25.0\src\terminal.rs:104:33
    |
104 | pub fn is_raw_mode_enabled() -> Result<bool> {
    |        -------------------      ^^^^^^^^^^^^ expected `Result<bool, Error>`, found `()`
    |        |
    |        implicitly returns `()` as its body has no tail or `return` expression
    |
    = note:   expected enum `std::result::Result<bool, std::io::Error>`
            found unit type `()`

[aschey]

There's some discussion on this at #654.

[oovm]

The support for wasi is different from that for wasm(which can be solved using javascript bind).

We need to sort out some basic capabilities of the terminal and submit proposals to the wit interface definition.

Then reintroduce these interfaces in rust ffi.