Function lib_flutter_rust_bridge_codegen::frb_codegen_multi

pub fn frb_codegen_multi(
    all_configs: &[Opts],
    index: usize,
    all_symbols: &[String]
) -> Result<()>

the all_configs here is used only for multi-blocks, because the current block needs information from all other blocks， and index refers to the index of current block to deal with.