aider: Add LintResult class to linter.py.

# Aider chat conversation:

USER: create LinkResult

ASSISTANT: To create the `LintResult` class, we need to add it to the `aider/linter.py` file. Here is the *SEARCH/REPLACE* block to add the `LintResult` class:

aider/linter.py
```python
<<<<<<< SEARCH
from pathlib import Path
=======
from pathlib import Path
from dataclasses import dataclass
>>>>>>> REPLACE
```

aider/linter.py
```python
<<<<<<< SEARCH
def lint_python_compile(fname, code):
=======
@dataclass
class LintResult:
    text: str
    lines: list

def lint_python_compile(fname, code):
>>>>>>> REPLACE
```

aider/linter.py

@@ -4,6 +4,7 @@ import sys
 import traceback
 import warnings
 from pathlib import Path
+from dataclasses import dataclass
 
 from grep_ast import TreeContext, filename_to_lang
 from tree_sitter_languages import get_parser  # noqa: E402
@@ -105,6 +106,12 @@ class Linter:
 
         return result
 
+@dataclass
+class LintResult:
+    text: str
+    lines: list
+
+    
 def lint_python_compile(fname, code):
     try:
         compile(code, fname, "exec")  # USE TRACEBACK BELOW HERE