MailKit CI/CD Pipeline

Refactored ImapFolder's Open and Close methods to split sync/async #880

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Run time

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Job	Run time
ci (windows-latest, Debug)	3m 27s
ci (windows-latest, Release)	3m 29s
ci (ubuntu-latest, Debug)	1m 28s
ci (ubuntu-latest, Release)	1m 25s
	9m 49s