CDRIVER-3780 Create public API to report whether a server session is dirty

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• Closed

PHPC-2003 Expose whether a client session is dirty

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• Closed

DRIVERS-768 Add more sessions tests with more read and write commands

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• Implementing

PHPC-1381 Discard ServerSessions involved in network errors

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• Closed

PHPLIB-788 Convert sessions spec tests to unified test format

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• Closed