Add new identity to the database without needing to restart the server

[glebfann]

Hello! I am reaching out to request a feature enhancement for this example: the ability to add new identities to the database without needing to restart the server. This update should not necessitate the use of refreshPIRParameters on the client side.
Implementing this feature would greatly benefit the community by providing a clearer understanding of how the service can effectively operate in a production environment.

[karulont]

#47 added support for reloading the dataset.

See Reusing PIR Parameters on how to preprocess the dataset in a way that the client configuration does not need to be changed, i.e refreshPIRParameters does not need to be called on the client side.