refactor(vm): extract baml_vm_types crate to decouple compiler from runtime (#2959)

Create new baml_vm_types crate containing:
- Bytecode and Instruction definitions (617+ instructions)
- Program<T> struct generic over native function bindings
- Value, Object, Function, Class, Enum types
- Type-safe pool indexing (ObjectPool, GlobalPool, Index<K>)
- Jump table data structures for O(1) match dispatch

Key architectural changes:
- baml_compiler_emit now depends only on baml_vm_types, not baml_vm
- Compiler emits Program<()> with unbound native function stubs
- VM binds native functions at construction: Program<()> →
Program<NativeFunction>
- New attach_builtins() resolves native function names to
implementations

Benefits:
- Compiled programs are now serializable (no function pointers)
- Enables shipping pre-compiled bytecode in inlined_baml
- Reduces code-gen: runtime loads bytecode instead of regenerating
- Cleaner separation between compilation and execution

BREAKING: Vm::from_program() now returns Result<Vm, VmError> since
native function binding can fail if a builtin is not found.

Author: hellovai

baml_language/Cargo.lock

@@ -33,6 +33,7 @@ baml_tests = { path = "crates/baml_tests" }
 baml_compiler_tir = { path = "crates/baml_compiler_tir" }
 baml_compiler_vir = { path = "crates/baml_compiler_vir" }
 baml_vm = { path = "crates/baml_vm" }
+baml_vm_types = { path = "crates/baml_vm_types" }
 baml_workspace = { path = "crates/baml_workspace" }
 baml_lsp_types = { path = "crates/baml_lsp_types" }
 baml_ide = { path = "crates/baml_ide" }