createDriver function
Creates a new async WebDriver using AsyncIoRequestClient.
This will bring in dependency on dart:io.
Note: WebDriver endpoints will be constructed using resolve against
uri. Therefore, if uri does not end with a trailing slash, the
last path component will be dropped.
Implementation
Future<core.WebDriver> createDriver(
        {Uri? uri,
        Map<String, dynamic>? desired,
        core.WebDriverSpec spec = core.WebDriverSpec.Auto,
        Map<String, String> webDriverHeaders = const {}}) =>
    core.createDriver(
        (prefix) => AsyncIoRequestClient(prefix, headers: webDriverHeaders),
        uri: uri,
        desired: desired,
        spec: spec);