Add parsing for conditionals (cont.)

Signed-off-by: Marcel Müller <neikos@neikos.email>

tests/cases/3-instructions@condition.snap

@@ -0,0 +1,42 @@
+---
+source: tests/file_tests.rs
+expression: emit
+input_file: tests/cases/condition.nomo
+---
+[
+    LoadFromContextToSlot {
+        name: "test" (6..10),
+        slot: VariableSlot {
+            index: 0,
+        },
+    },
+    JumpIfNotTrue {
+        emit_slot: VariableSlot {
+            index: 0,
+        },
+        jump: 3,
+    },
+    AppendContent {
+        content: "\n    " (13..18),
+    },
+    AppendContent {
+        content: "Hello World!" (18..30),
+    },
+    AppendContent {
+        content: "\n" (30..31),
+    },
+    AppendContent {
+        content: "\n\n" (40..42),
+    },
+    LoadFromContextToSlot {
+        name: "stuff" (46..51),
+        slot: VariableSlot {
+            index: 1,
+        },
+    },
+    EmitFromSlot {
+        slot: VariableSlot {
+            index: 1,
+        },
+    },
+]