Improvements to the tracing and logging in wasmer

- Now using the fmt subscriber for improved formatting
- Using spans on all syscalls
- Added recorded fields on the spans instead trace and debug macros
- Adding timing on all syscall

lib/api/src/function_env.rs

@@ -1,4 +1,4 @@
-use std::{any::Any, marker::PhantomData};
+use std::{any::Any, fmt::Debug, marker::PhantomData};
 
 use crate::vm::VMFunctionEnvironment;
 
@@ -102,6 +102,12 @@ pub struct FunctionEnvMut<'a, T: 'a> {
     pub(crate) func_env: FunctionEnv<T>,
 }
 
+impl<'a, T> Debug for FunctionEnvMut<'a, T> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "env_mut")
+    }
+}
+
 impl<T: Send + 'static> FunctionEnvMut<'_, T> {
     /// Returns a reference to the host state in this function environement.
     pub fn data(&self) -> &T {

lib/api/src/ptr.rs

@@ -278,11 +278,6 @@ impl<T: ValueType, M: MemorySize> Eq for WasmPtr<T, M> {}
 
 impl<T: ValueType, M: MemorySize> fmt::Debug for WasmPtr<T, M> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(
-            f,
-            "WasmPtr(offset: {}, pointer: {:#x})",
-            self.offset.into(),
-            self.offset.into()
-        )
+        write!(f, "{}(@{})", std::any::type_name::<T>(), self.offset.into())
     }
 }