[DPE-10186] add entity-type and entity-permissions to Valkey integration

[reneradoi]

This PR adds the fields entity-type and entity-permissions to the interface for Valkey. This is required to implement LDAP support in Valkey, as a group-mapping is supposed to be configured through Data integrator via the entity-permissions config (see DA269 for details).

An example configuration would look like this:

juju config data-integrator prefix-name="<desired_keyspace>:" entity-type="GROUP" entity-permissions="[{\"resource_name\": \"ldap_users_write\", \"resource_type\": \"acl\", \"privileges\": [\"read\", \"write\", \"pubsub\"]}, {\"resource_name\": \"ldap_users_read\", \"resource_type\": \"acl\", \"privileges\": [\"read\"]}]"

juju config valkey ldap-map="<ldap_group_name>:ldap_users_write,<another_ldap_group>:ldap_users_read"

[imanenami]

LGTM