Add `Pod` model

[guzman-raphael]

struct Annotation {
    api_ver: String // Adopt the version lib
    name: String,
    version: String,  // better option could be used later for inequalities
    description: String,
}

struct Pod {
    annotation: Annotation,
    command: String,
    gpu: Option<GPUSpecRequirement>,
    image_digest: String, // resolved docker image+digest
    input_stream_map: BTreeMap<String, PathBuf>,
    // might default to /output but needs
    output_dir: PathBuf,
    // here PathBuf will be relative to output_dir
    output_stream_map: BTreeMap<String, PathBuf>,
    recommended_cpus: f32,  // e.g. 0.25
    recommended_memory: u64, // e.g. 2GiB -> 2147483648 bytes
    sha256: String,  // pod hash, might be a better type
    source: String, // Git Commmit permalink
}

impl Pod {
    fn new(...) -> Self {...}

// Use the new derivative default lib
}

impl OrcaHash for Pod {
    fn to_yaml(&self) -> String
   pub fn compute_hash(&self) -> String
  fn from_yaml(yaml: &str, annotation: &str) -> Self
} 

[Synicix]

6