add a hook to ResourceLimiter to detect memory grow failure.

* allow the ResourceLimiter to reject a memory grow before the
memory's own maximum.
* add a hook so a ResourceLimiter can detect any reason that
a memory grow fails, including if the OS denies additional memory
* add tests for this new functionality. I only took the time to
test the OS denial on Linux, it should be possible on Mac OS
as well but I don't have a test setup. I have no idea how to
do this on windows.

tests/all/memory_creator.rs

@@ -62,7 +62,7 @@ mod not_for_windows {
             Some(self.size - self.guard_size)
         }
 
-        fn grow_to(&mut self, new_size: usize) -> Option<()> {
+        fn grow_to(&mut self, new_size: usize) -> Result<(), anyhow::Error> {
             println!("grow to {:x}", new_size);
             let delta = new_size - self.used_wasm_bytes;
             unsafe {
@@ -73,7 +73,7 @@ mod not_for_windows {
 
             *self.glob_bytes_counter.lock().unwrap() += delta;
             self.used_wasm_bytes = new_size;
-            Some(())
+            Ok(())
         }
 
         fn as_ptr(&self) -> *mut u8 {