✨🧪💩➕➖ workspace, vanth, varo: Add varo crate and Root struct, update dependencies

- Replaced `bitcode` crate with `bincode` in workspace dependencies.
- Added new crate `varo` for random optimization with `Varo` trait, `Distribution`, and `optimize` function.
- Defined `Root` world struct placeholder in `vanth` crate.
- Created `reference.rs` test module in `vanth` with custom components and events.
- Added TODOs in `varo` for RNG implementation and `optimize` function.

crates/varo/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "varo"
+version.workspace = true
+edition.workspace = true
+
+[lib]
+path = "src/lib.rs"
+
+[dependencies]
+digest.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+blake3.workspace = true
+vanth = { path = "../vanth" }
+vanth_derive = { path = "../vanth_derive" }
+rand_core.workspace = true
+
+[dev-dependencies]
+tempfile = { workspace = true }