[MiNiFi] MiNiFi toolkit encrypt config should support encrypting flow.json.raw file

MiNiFi flows can be encrypted when downloading from ingestors or through c2 protocol, but when we edit it manually there is no way to encrypt sensitive properties.

The nifi-toolkit-encrypt config supports encrypting the flow.json.gz, but it works only for this format.

MiNiFi should provide a similar way to encrypt flows manually.