Forward shutdown reason to awaitStatus exception

[MinnDevelopment]

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Description

This provides the context of shutdowns to the exceptions throw by awaitStatus:

Exception in thread "main" java.lang.IllegalStateException: Was shutdown trying to await status.
Reason: You tried turning on an intent you aren't allowed to use. For more information check https://jda.wiki/using-jda/troubleshooting/#im-getting-closecode4014-disallowed-intents
	at net.dv8tion.jda.internal.JDAImpl.awaitStatus(JDAImpl.java:494)
	at net.dv8tion.jda.api.JDA.awaitStatus(JDA.java:324)
	at net.dv8tion.jda.api.JDA.awaitReady(JDA.java:374)