Epochs don't interrupt binaries with long time.Sleep durations

Hi!

I'm trying to execute the following go snippet compiled to WASM:

```
package main

import time

func main() {
time.Sleep(10 * time.Second)
}
```

and am using an epoch deadline (set to "3"), which is being incremented every 100 milliseconds. In other words, the deadline for this is 300 milliseconds.

However, this isn't behaving as I expect using wasmtime-go: with the wasm trap only firing after the time.Sleep call has completed.

Is this expected behaviour?

Thanks!