aider: Added completions_height parameter to InputOutput class and passed it from aider/main.py.

# Context:
USER: pass it to `InputOutput` and store as a self. var
ASSISTANT: I will modify the `InputOutput` class in `aider/io.py` to accept the `completions_height` parameter and store it as an instance variable.

Here's the change to add the `completions_height` parameter to the `InputOutput` class:

```python
aider/io.py

^C KeyboardInterrupt
USER: `aider/io.py`
ASSISTANT: I will modify the `InputOutput` class in `aider/io.py` to accept the `completions_height` parameter and store it as an instance variable.

Here's the change to add the `completions_height` parameter to the `InputOutput` class:

```python
aider/io.py
<<<<<<< ORIGINAL
    def __init__(
        self,
        pretty=True,
        yes=False,
        input_history_file=None,
        chat_history_file=None,
        input=None,
        output=None,
        user_input_color="blue",
        tool_output_color=None,
        tool_error_color="red",
    ):
=======
    def __init__(
        self,
        pretty=True,
        yes=False,
        input_history_file=None,
        chat_history_file=None,
        input=None,
        output=None,
        user_input_color="blue",
        tool_output_color=None,
        tool_error_color="red",
        completions_height=10,
    ):
        self.completions_height = completions_height
>>>>>>> UPDATED
```

Now, you need to pass the `completions_height` value from `aider/main.py` to the `InputOutput` class when creating an instance:

```python
aider/main.py
<<<<<<< ORIGINAL
    io = InputOutput(
        args.pretty,
        args.yes,
        args.input_history_file,
        args.chat_history_file,
        input=input,
        output=output,
        user_input_color=args.user_input_color,
        tool_output_color=args.tool_output_color,
        tool_error_color=args.tool_error_color,
    )
=======
    io = InputOutput(
        args.pretty,
        args.yes,
        args.input_history_file,
        args.chat_history_file,
        input=input,
        output=output,
        user_input_color=args.user_input_color,
        tool_output_color=args.tool_output_color,
        tool_error_color=args.tool_error_color,
        completions_height=args.completions_height,
    )
>>>>>>> UPDATED
```

Now, the `completions_height` value is passed to the `InputOutput` class and stored as an instance variable.

aider/io.py

@@ -88,7 +88,9 @@ class InputOutput:
         user_input_color="blue",
         tool_output_color=None,
         tool_error_color="red",
+        completions_height=10,
     ):
+        self.completions_height = completions_height
         no_color = os.environ.get("NO_COLOR")
         if no_color is not None and no_color != "":
             pretty = False

aider/main.py

@@ -205,6 +205,7 @@ def main(args=None, input=None, output=None):
         user_input_color=args.user_input_color,
         tool_output_color=args.tool_output_color,
         tool_error_color=args.tool_error_color,
+        completions_height=args.completions_height,
     )
 
     if args.verbose: