Add interface for viewing previous configurations and rolling back to a previous configuration/deployment

Essentially create a UI for:

> Add a restore_previous_configuration operation that can restore a previous configuration version. This operation request should include the timestamp (which can be determined from list_previous_configurations) and will copy the designated config file from ~/hdb/backup to ~/hdb/harperdb-config.yaml

and

> Implement a list_previous_configurations operation that will list all the config files in the hdb/backup folder, returning their timestamp. These backup files should be created whenever set_configuration or deploy_component is used to save the previous state of the configuration.

https://github.com/HarperFast/harper/issues/665