Initiate main span for CLI applications

[andrew-demb]

For now, the library initiates the main span only for the HTTP context, but not for the CLI.

jaeger-client-symfony-bridge/src/Bridge/MainSpanLifecycleListener.php

Lines 20 to 26 in 463ceef

	public static function getSubscribedEvents(): array
	{
	return [
	RequestEvent::class => ['onRequest', 1024],
	TerminateEvent::class => ['onTerminate', 4096],
	];
	}