Add a new case in the `readRawToken` function within `src/wren_compiler.c` to map the semicolon character to the `TOKEN_LINE` token type, enabling semicolons to function as line separators in the Wren language parser.
Include a test file `test/semicolon.wren` that verifies the new behavior by using a semicolon to separate two statements on a single line, with the expected output "ok".
