message: stabilize `is_contract` and `caller_is_origin`
diff: @@ -284,6 +284,10 @@ mod sys {
  output_ptr: Ptr32Mut<[u8]>,
  );
  + pub fn seal_is_contract(account_id_ptr: Ptr32<[u8]>) -> ReturnCode;
  +
  + pub fn seal_caller_is_origin() -> ReturnCode;
  +
  #[cfg(feature = "ink-debug")]
  pub fn seal_debug_message(str_ptr: Ptr32<[u8]>, str_len: u32) -> ReturnCode;
  }
  @@ -334,10 +338,6 @@ mod sys {
  message_hash_ptr: Ptr32<[u8]>,
  output_ptr: Ptr32Mut<[u8]>,
  ) -> ReturnCode;
  -
  - pub fn seal_is_contract(account_id_ptr: Ptr32<[u8]>) -> ReturnCode;
  -
  - pub fn seal_caller_is_origin() -> ReturnCode;
  }
  }
  