* Refactored Kusto.ServiceLayer to pass ConnectionDetails to DataSourceFactory instead of connection string. Created KustoConnectionDetails to map needed details to KustoClient.
* Removed unused ScriptingScriptOperation from KustoServiceLayer.
* Created DstsAuthenticationManager and moved logic for getting DstsToken. Updated error message for failing to create KustoConnection.
* Removed DstsAuthenticationManager.cs. Refactored DataSourceFactory to retrieve UserToken from ConnectionDetails.
* Renamed AzureAccountToken in ConnectionDetails to AccountToken. Changed mapping to KustoConnectionDetails based on the AccountToken.
* Removed Kusto.Data reference from ConnectionService and ScriptingListObjectsOperation. Moved creation of KustoConnectionStringBuilder to DataSourceFactory
* Added accountToken validation to DataSourceFactory Create.
* Renamed KustoConnectionDetails to DataSourceConnectionDetails. Renamed AzureToken to AuthToken.
* Refactored SchemaState and intellisense out of KustoClient to KustoIntellisenseClient. Added IIntellisenseClient. Added unit tests for KustoIntellisenseClient and KustoClient.
* Removed unused property dataSourceFactory from LanguageService > InitializeService. Moved KustoIntellisense functions from KustoIntellisenseHelper to KustoIntellisenseClient and made SchemaState private. Added IIntellisenseClient to IDataSource.
* Renamed directory from DataSourceIntellisense to Intellisense and updated namespace. Fixed namespace in ScriptDocumentInfo.
