message: Add example grow_memory wast file
diff: (module
  (memory 1)
  - (func $grow_mem (result i32)
  - (grow_memory (i32.const 1))
  - )
  (func $main (export "main") (result i32)
  - (call $grow_mem)
  + (drop (memory.grow (i32.const 1)))
  + (i32.store (i32.const 400) (i32.const 1600))
  + (i32.load (i32.const 1600))
  )
  )
  