feat: Implement for loops, break, and continue statements

examples/loops_advanced.fem

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+my_list is ["apple", "banana", "cherry"]
+Tomgirl item is my_list Femboycore
+    UwU Boy item
+Periodt
+
+my_string is "Femboy"
+Tomgirl char is my_string Femboycore
+    UwU Boy char
+Periodt
+
+counter is 0
+Otokonoko counter < 10 Femboycore
+    counter is counter + 1
+    Femboy Feminine counter == 5 Femboycore
+        Break
+    Periodt
+    Femboy Feminine counter == 2 Femboycore
+        Continue
+    Periodt
+    UwU Boy counter
+Periodt