feat(tazjin/rlox): Initial bytecode representation

This is significantly simplified from the version in the book, since
I'm using Rust's Vec and not implementing dynamic arrays manually.

We'll see if I run into issues with that ...

Change-Id: Ie3446ac3884b850f3ba73a4b1a6ca14e68054188
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2413
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI

users/tazjin/rlox/src/bytecode/mod.rs

@@ -2,6 +2,19 @@
 //!
 //! https://craftinginterpreters.com/chunks-of-bytecode.html
 
+mod chunk;
+mod opcode;
+mod value;
+
+use chunk::Chunk;
+use opcode::OpCode;
+
 pub fn main() {
-    unimplemented!()
+    let mut chunk: Chunk = Default::default();
+
+    let constant = chunk.add_constant(1.2);
+    chunk.add_op(OpCode::OpConstant(constant));
+    chunk.add_op(OpCode::OpReturn);
+
+    chunk::disassemble(&chunk, "test chunk");
 }