feat(lexer): add multiline comments

examples/06_comments.peb

@@ -0,0 +1,7 @@
+let var1 = 3 // A comment
+let var2 // A second comment *{}
+12 /*
+var1 += var2
+*/ 34
+
+56 /* // drgdr */ 78

main.py

@@ -10,7 +10,7 @@ def main():
     123
     "This is
      another string" """
-    path: str = "examples/05_loop.peb"
+    path: str = "examples/06_comments.peb"
     with open(path, "r") as f:
         source = f.read()
     lexer: Lexer = Lexer()

src/lexer.py

@@ -119,9 +119,9 @@ class Lexer:
                 self.add_token(TokenType.LESS_EQUAL if self.match("=") else TokenType.LESS)
             case "/":
                 if self.match("/"):
-                    while self.peek() != "\n" and not self.is_at_end():
-                        self.advance()
-                    self.add_token(TokenType.COMMENT)
+                    self.scan_comment()
+                elif self.match("*"):
+                    self.scan_comment_multiline()
                 else:
                     self.add_token(TokenType.SLASH_EQUAL if self.match("=") else TokenType.SLASH)
             case " " | "\r" | "\t" | "\n":
@@ -169,3 +169,17 @@ class Lexer:
         lexeme: str = self.source[self.start:self.idx]
         token_type: TokenType = KEYWORDS.get(lexeme, TokenType.IDENTIFIER)
         self.add_token(token_type)
+
+    def scan_comment(self):
+        while self.peek() != "\n" and not self.is_at_end():
+            self.advance()
+        self.add_token(TokenType.COMMENT)
+
+    def scan_comment_multiline(self):
+        while not (self.peek() == "*" and self.peek_next() == "/") and not self.is_at_end():
+            self.advance()
+        if not self.is_at_end():
+            self.advance()
+        if not self.is_at_end():
+            self.advance()
+        self.add_token(TokenType.COMMENT)