feat: Added ApplicationNotRespondingException type

[bitsandfoxes]

The ApplicationNotResponding exception was previously internal.

This can now be consumed i.e. in a BeforeSend callback to modify or filter

options.SetBeforeSend((sentryEvent, _) =>
{
    if (sentryEvent.Exception is ApplicationNotRespondingException)
    {
        return null;
    }

    return sentryEvent;
});

[github-actions]

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📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

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