Don't hardcode flake schema types

[shivaraj-bh]

omnix/crates/nix_rs/src/flake/schema.rs

Lines 16 to 35 in c566f7a

	#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
	pub struct FlakeSchema {
	pub system: System,
	pub packages: BTreeMap<String, Leaf>,
	pub legacy_packages: BTreeMap<String, Leaf>,
	pub devshells: BTreeMap<String, Leaf>,
	pub checks: BTreeMap<String, Leaf>,
	pub apps: BTreeMap<String, Leaf>,
	pub formatter: Option<Leaf>,
	pub nixos_configurations: BTreeMap<String, Leaf>,
	pub darwin_configurations: BTreeMap<String, Leaf>,
	pub home_configurations: BTreeMap<String, Leaf>,
	pub nixos_modules: BTreeMap<String, Leaf>,
	pub docker_images: BTreeMap<String, Leaf>,
	pub overlays: BTreeMap<String, Leaf>,
	pub templates: BTreeMap<String, Leaf>,
	pub schemas: BTreeMap<String, Leaf>,
	/// Other unrecognized keys.
	pub other: Option<BTreeMap<String, FlakeOutputs>>,
	}

To avoid maintaining these types in rust