in_winevtlog: Display error on invalid subscription state

[cosmo0920]

Fluent Bit is also using pull subscription model for collecting Windows EventLog. Through a registered signal, we're able to obtain the internal state of EvtSubscribe API.
Like as fluent-plugins-nursery/winevt_c#44 fix, Fluent Bit can be made to detect the failure of the subscription.
We need to check it for more strict approach to handle subscription for EventLog.
When failed status is returned from a registered signal, we should recreate the subscription if possible.

This signal approach is inspired from the article: https://learn.microsoft.com/en-us/windows/win32/wes/subscribing-to-events#pull-subscriptions
This article describes that when using the pull type of subscription, EvtSubscribe can tell whether Windows EventLogs are collected or not via a registered signal.

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[cosmo0920]

I resync implementation on this PR what winevt_c's PR does. I tested to try to make invalid status but the event signal does not respond for stale of EvtSubscribe. Checking WAIT_FAILED brunch is just for needed for the possibility to be returned from WaitForSingleObject Windows API.