check may-leave flag automatically for CM intrinsic trampolines

[dicej]

The component model async implementation contains a lot of intrinsic functions, each of which currently has hand-written code to check the may-leave flag and trap if it's unset. Instead, we should check this in e.g. ComponentInstance::enter_host_from_wasm so we don't have to do it manually for each intrinsic.

[dicej]

However, per #12403, not all intrinsics should check may-leave, so we'll still have to provide a way to enable or disable the check on a per-intrinsic basis.