Asynchronously starts the external process using the specified configuration.
[UnsupportedOSPlatform("ios")]
[UnsupportedOSPlatform("tvos")]
[UnsupportedOSPlatform("browser")]
public Task StartAsync(CancellationToken cancellationToken)
A cancellation token that can be used by other objects or threads to receive notice of cancellation.
Configuration is not mutated; the resolved file path is returned via the result. ExecutedFilePath.