enhancement: use panic_hook to retrieve message from a failed WASM execution

[lostman]

Description

Closes #1402.

This PR adds WasmIndexerError::Panic variant and registers a panic hook in the WASM indexer.

The panic message is stored in a static mut String, and an early_exit is triggered. The message is then retrieved by thy indexer service and logged.

Testing steps

CI tests should pass.

For manual testing, deploy an indexer that causes panic (for instance, by calling unwrap() on the None value in the handler function), and observe the panic error message in the logs of fuel-indexer.

Changelog

• Add WasmIndexerError::Panic
• Generate code to store and retrieve panic messages in the WASM.
• Add get_panic_message function to Executor trait. For native executor, it always returns an error.

[ra0x3]

It works, thanks @lostman