MODE-1802 - Fixed the handling of root projections for the FileSystemConnector
MODE-1802 - Updated as per code review, moved and added a test case to FileSystemConnectorTest.
MODE-1799 - Fixed the moving of nodes located under root.
MODE-1791 - Added the "readonly" attribute to the connector hierarchy and implemented support for it in the base connector class. Also. updated the JSON schema to support it.
MODE-1791- Updated the read-only option for connectors by adding a WritableConnector base class which now contains the flag and by moving the read-only checks to the FederatedDocumentStore.