feat(bytecode): add opcode set

src/main/kotlin/lumen/bytecode/Opcode.kt

@@ -0,0 +1,55 @@
+package lumen.bytecode
+
+enum class Opcode {
+    Constant,
+    Nil,
+    True,
+    False,
+    Pop,
+
+    Add,
+    Sub,
+    Mul,
+    Div,
+    Mod,
+    Negate,
+
+    Equal,
+    NotEqual,
+    Less,
+    LessEqual,
+    Greater,
+    GreaterEqual,
+    Not,
+
+    GetLocal,
+    SetLocal,
+    GetGlobal,
+    SetGlobal,
+    DefineGlobal,
+    GetUpvalue,
+    SetUpvalue,
+
+    Jump,
+    JumpIfFalse,
+    Loop,
+
+    Call,
+    Invoke,
+    Closure,
+    CloseUpvalue,
+    Return,
+
+    BuildList,
+    BuildMap,
+    IndexGet,
+    IndexSet,
+
+    GetIter,
+    ForIter;
+
+    companion object {
+        private val values = entries.toTypedArray()
+        fun from(ordinal: Int): Opcode = values[ordinal]
+    }
+}