✨🧪♻️➕ vanth, vanth_derive: Add derive macro for Vanth trait implementation

- Added `vanth_derive` crate with a procedural macro to automatically implement the `Vanth` trait for structs, including generics.
- Refactored `vanth` crate by removing obsolete `vanth.rs` file.
- Implemented `PartialEq` for `Ty` to enable comparisons with string values and another `Ty`.
- Added integration tests for deriving `Vanth` with generic parameters.
- Updated dependencies: added `quote`, `syn`, and `proc-macro2` crates.

crates/vanth_derive/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "vanth_derive"
+version.workspace = true
+edition.workspace = true
+
+[lib]
+proc-macro = true
+
+[dependencies]
+quote.workspace = true
+syn.workspace = true
+proc-macro2.workspace = true