[MRG] update the preview_csv_data function

[leeeizhang]

Enhances the preview_csv_data function to provide a more comprehensive summary of csv files:

• adding column types to the preview summary
• including the count of NaN values to assist in handling these fields during code generation
• adding examples for each column
• including data ranges for numeric data types

Before:

Data file: /mnt/data00/mle-bench/spaceship-titanic/prepared/public/train.csv
Number of all rows: 7823
All columns: PassengerId, HomePlanet, CryoSleep, Cabin, Destination, Age, VIP, RoomService, FoodCourt, ShoppingMall, Spa, VRDeck, Name, Transported
Data example:
{'PassengerId': '4408_01', 'HomePlanet': 'Mars', 'CryoSleep': True, 'Cabin': 'F/906/P', 'Destination': 'TRAPPIST-1e', 'Age': 75.0, 'VIP': False, 'RoomService': 0.0, 'FoodCourt': 0.0, 'ShoppingMall': 0.0, 'Spa': 0.0, 'VRDeck': 0.0, 'Name': 'Pich Knike', 'Transported': True}

After:

CSV file in `/mnt/data00/mle-bench/spaceship-titanic/prepared/public/train.csv` has 7823 rows and 14 columns.
Here is some information about the columns:
Age (float64) has range: 0.00 - 79.00, 162 NaN values
Cabin (object) has 5992 unique values. Some example values: ['B/11/S', 'E/13/S', 'G/109/P', 'C/137/S', 'F/1411/P']
CryoSleep (object) has 2 unique values: [True, False, nan]
Destination (object) has 3 unique values: ['TRAPPIST-1e', 'PSO J318.5-22', '55 Cancri e', nan]
FoodCourt (float64) has range: 0.00 - 27723.00, 169 NaN values
HomePlanet (object) has 3 unique values: ['Mars', 'Europa', 'Earth', nan]
Name (object) has 7625 unique values. Some example values: ['Asch Stradick', 'Juane Popelazquez', 'Keitha Josey', 'Dia Cartez', 'Ankalik Nateansive']
PassengerId (object) has 7823 unique values. Some example values: ['4408_01', '8869_01', '0111_01', '0540_01', '5257_01']
RoomService (float64) has range: 0.00 - 14327.00, 165 NaN values
ShoppingMall (float64) has range: 0.00 - 23492.00, 188 NaN values
Spa (float64) has range: 0.00 - 22408.00, 168 NaN values
Transported (bool) is 50.44% True, 49.56% False
VIP (object) has 2 unique values: [False, True, nan]
VRDeck (float64) has range: 0.00 - 24133.00, 169 NaN values

Before submitting this PR, please make sure you have:

• confirmed all checks still pass OR confirm CI build passes.
• verified that any code or assets from external sources are properly credited in comments and/or in
  the credit file.

[huangyz0918]

Some people in Discord mentioned that if they have too many columns, the token will exceed the max context window size. Should we add a limit to the number of max preview columns?