MINIFICPP-2127 Add multipart upload support for PutS3Object processor

[lordgamez]

https://issues.apache.org/jira/browse/MINIFICPP-2127
https://issues.apache.org/jira/browse/MINIFICPP-2140

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[lordgamez]

@szaszm Changed the state manager to be able to use it for multipart upload states in b91b756 It seems to be enough to return true for commit and rollback calls if no transaction is in progress in libminifi/src/controllers/keyvalue/KeyValueStateManager.cpp, so it wouldn't return any error in the ProcessSession in case all transactions were commited previously.