The current implementation of remote attestation does not take into account the integrity of the wasm module. The SHA256 of the wasm module has been put into user_data to generate the quote, and more parameters are exposed for further verification.
Should call `wasm_native_destroy` to destroy the registered native libs when registering native lib failed in `wasm_native_init`.
Add library librats, update SGX build scripts, add sample and update document.
