Version configuration

[markmandel]

We should have a version for the configuration files.

Probably something akin to K8s, with a apiVersion: v1alpha1 for the first line

Don't think we need a grouping like apps/v1 like K8s does though.

[markmandel]

Since we have https://github.com/googleforgames/quilkin/blob/main/src/config/mod.rs#L43-L47 I think this can be closed now.

#[derive(Debug, Deserialize, Serialize)]
pub enum Version {
    #[serde(rename = "v1alpha1")]
    V1Alpha1,
}

Any objections?

[iffyio]

Sounds good!