Add Rust code generation to LCM message definitions

[spomichter]

Prerequisite for #1616 (Rust Rerun bridge).

Add Rust LCM type code generation to https://github.com/dimensionalOS/dimos-lcm

Tasks:

• Add lcm-gen Rust backend (or equivalent tool) to generate Rust structs from .lcm type definitions
• Generate Rust bindings for existing DimOS LCM messages (sensor types, transforms, etc.)
• Integrate into build system (likely alongside existing Python codegen)
• Verify serialization/deserialization compatibility with Python LCM messages

Context:
Rust native modules (like the planned Rerun bridge) need native LCM message types. Currently only Python codegen exists in dimos-lcm.

References:

• dimos-lcm repo: https://github.com/dimensionalOS/dimos-lcm
• Blocked issue: Rust Rerun bridge #1616