This commit renames `wasi_config_set_std[in|out|err]` to `wasi_config_set_std[in|out|err]_file` so we can reserve the former for when the C API supports a stream abstraction.
This commit renames `wasi_config_set_std[in|out|err]` to `wasi_config_set_std[in|out|err]_file` so we can reserve the former for when the C API supports a stream abstraction.