Add Litematica exporter and integrate serde for serialization

- Introduced Litematica exporter with necessary data structures for Minecraft text generation.
- Added serde dependency for serialization support in multiple crates.
- Updated Cargo.toml files to include new dependencies and features.
- Created palette module for block palette management.

Cargo.toml

@@ -7,3 +7,4 @@ anyhow = "1.0.102"
 thiserror = "2.0.18"
 tracing = "0.1.44"
 tracing-subscriber = { version = "0.3.23", features = ["env-filter"] }
+serde = { version = "1.0.228", features = ["derive"] }