Add for loop

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

tests/cases/1-parsed@simple_for.snap

@@ -0,0 +1,41 @@
+---
+source: tests/file_tests.rs
+expression: parsed
+info:
+  context:
+    values:
+      - one
+      - two
+input_file: tests/cases/simple_for.nomo
+---
+ParsedTemplate {
+    tokens: [
+        [LeftDelim]"{{" (0..2),
+        [Whitespace]" " (2..3),
+        [For]"for" (3..6),
+        [Whitespace]" " (6..7),
+        [Ident]"value" (7..12),
+        [Whitespace]" " (12..13),
+        [In]"in" (13..15),
+        [Whitespace]" " (15..16),
+        [Ident]"values" (16..22),
+        [Whitespace]" " (22..23),
+        [TrimWhitespace]"-" (23..24),
+        [RightDelim]"}}" (24..26),
+        [Whitespace]"\n    " (26..31),
+        [LeftDelim]"{{" (31..33),
+        [TrimWhitespace]"-" (33..34),
+        [WantsOutput]"=" (34..35),
+        [Whitespace]" " (35..36),
+        [Ident]"value" (36..41),
+        [Whitespace]" " (41..42),
+        [RightDelim]"}}" (42..44),
+        [Whitespace]"\n" (44..45),
+        [LeftDelim]"{{" (45..47),
+        [TrimWhitespace]"-" (47..48),
+        [Whitespace]" " (48..49),
+        [End]"end" (49..52),
+        [Whitespace]" " (52..53),
+        [RightDelim]"}}" (53..55),
+    ],
+}