Add parsing for conditionals (cont.)

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

tests/cases/1-parsed@condition.snap

@@ -0,0 +1,31 @@
+---
+source: tests/file_tests.rs
+expression: parsed
+input_file: tests/cases/condition.nomo
+---
+ParsedTemplate {
+    tokens: [
+        "{{" (0..2),
+        " " (2..3),
+        "if" (3..5),
+        " " (5..6),
+        "test" (6..10),
+        " " (10..11),
+        "}}" (11..13),
+        "\n    " (13..18),
+        "Hello World!" (18..30),
+        "\n" (30..31),
+        "{{" (31..33),
+        " " (33..34),
+        "end" (34..37),
+        " " (37..38),
+        "}}" (38..40),
+        "\n\n" (40..42),
+        "{{" (42..44),
+        "=" (44..45),
+        " " (45..46),
+        "stuff" (46..51),
+        " " (51..52),
+        "}}" (52..54),
+    ],
+}