Fixit cli doesn't return non-zero exit code upon exceptions - add --exit-non-zero / --exit-zero options about fixit HOT 2 CLOSED

$ cat t.py
this is not valid python

$ fixit fix -a t.py
t.py: EXCEPTION: Syntax Error @ 1:1.
parser error: error at 1:24: expected one of !=, %, &, (, *, **, +, ,, -, ., /, //, ;, <, <<, <=, ==, >, >=, >>, @, NEWLINE, [, ^, and, if, in, is, not, or, |

this is not valid python
^
Traceback (most recent call last):
  File "/private/tmp/tmpvenv-c329d/venv/lib/python3.11/site-packages/fixit/api.py", line 100, in fixit_bytes
    runner = LintRunner(path, content)
             ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/tmpvenv-c329d/venv/lib/python3.11/site-packages/fixit/engine.py", line 55, in __init__
    self.module: Module = parse_module(source)
                          ^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/tmpvenv-c329d/venv/lib/python3.11/site-packages/libcst/_parser/entrypoints.py", line 109, in parse_module
    result = _parse(
             ^^^^^^^
  File "/private/tmp/tmpvenv-c329d/venv/lib/python3.11/site-packages/libcst/_parser/entrypoints.py", line 55, in _parse
    return parse(source_str)
           ^^^^^^^^^^^^^^^^^
libcst._exceptions.ParserSyntaxError: Syntax Error @ 1:1.
parser error: error at 1:24: expected one of !=, %, &, (, *, **, +, ,, -, ., /, //, ;, <, <<, <=, ==, >, >=, >>, @, NEWLINE, [, ^, and, if, in, is, not, or, |

this is not valid python
^
🛠️  1 file checked, 1 file with errors 🛠️

$ echo $?
0