Allow customization for the generated enum name

[vlsi]

Consider the following use case:

group("signing") {
    group("pgp") {
        enumeration("enabled") {
            defaultValue.set("AUTO")
            values.addAll("AUTO", "OFF")
            description.set("Configures whether PGP signing should be enabled or not. By default (AUTO) signing is enabled for release versions")
        }
        enumeration("implementation") {
            defaultValue.set("IN_MEMORY")
            values.addAll("IN_MEMORY", "GPG_CLI")
            description.set("Configures PGP implementation to use. By default (IN_MEMORY) PGP keys are stored in memory")
        }
    }
    group("sigstore") {
        enumeration("enabled") {
            defaultValue.set("AUTO")
            values.addAll("AUTO", "OFF")
            description.set("Configures whether Sigstore signing should be enabled or not. By default (AUTO) signing is enabled for release versions")
        }
    }
}

enabled generates the following:

package buildparameters.signing.pgp;

public enum Enabled {

I am afraid Enabled would collide between .sigstore.Enabled and .pgp.Enabled, and I would like to make enum names a bit more specific.
For instance enum PgpEnabled vs enum SigstoreEnabled.