Parse Configuration Retrieval Timestamp for Comparison and Datasets

NetBrain does not currently expose the timestamp of when a device configuration was retrieved as a parsable data field. As a result, users performing configuration comparisons or working with datasets have no reliable way to determine when a given configuration snapshot was pulled. This enhancement proposes adding the ability to parse and surface the configuration retrieval timestamp so it can be referenced in configuration comparison results and dataset outputs. Exposing this timestamp as structured data would help customers accurately correlate configuration changes to specific points in time, improving confidence in comparison results and supporting more precise audit and change analysis.