add wasmi_error_message impl

Author: pwang200

recipes/wasmi/all/patches/0001-xrplf-0.42.1.patch

@@ -129,6 +129,34 @@ index 2caffa3..0c0584e 100644
 +#define WASMI_VERSION_PATCH 1
 
  #endif // WASMI_H
+diff --git a/crates/c_api/src/error.rs b/crates/c_api/src/error.rs
+index f51aff8..dc85727 100644
+--- a/crates/c_api/src/error.rs
++++ b/crates/c_api/src/error.rs
+@@ -1,4 +1,5 @@
+-use alloc::{boxed::Box, string::String};
++use crate::wasm_name_t;
++use alloc::{boxed::Box, string::String, vec::Vec};
+ use core::ffi;
+ use wasmi::Error;
+ 
+@@ -50,3 +51,16 @@ pub(crate) fn handle_result<T>(
+         Err(error) => Some(Box::new(wasmi_error_t::from(error))),
+     }
+ }
++
++/// Returns the error message of the [`wasmi_error_t`].
++///
++/// Stores the returned error message in `out`.
++#[cfg_attr(not(feature = "prefix-symbols"), no_mangle)]
++#[cfg_attr(feature = "prefix-symbols", wasmi_c_api_macros::prefix_symbol)]
++pub extern "C" fn wasmi_error_message(error: &wasmi_error_t, out: &mut wasm_name_t) {
++    let mut buffer = Vec::new();
++    buffer.extend_from_slice(format!("{:?}", error.inner).as_bytes());
++    buffer.reserve_exact(1);
++    buffer.push(0);
++    out.set_buffer(buffer.into());
++}
 diff --git a/crates/c_api/src/store.rs b/crates/c_api/src/store.rs
 index 56d4898..9abda8e 100644
 --- a/crates/c_api/src/store.rs