fix: logging behavior based on verbose and save_logs settings

[gventuri]

Related to #1167

Updates the Logger class in pandasai/helpers/logger.py to respect the verbose and save_logs settings more accurately.

• Modifies the __init__ method to conditionally add logging.StreamHandler(sys.stdout) only if verbose is True, ensuring that logs are not printed to the console when verbose is False.
• Adjusts the log method to check the _verbose attribute before logging messages to the console, allowing for more granular control over what gets logged based on the verbosity level.
• Updates the save_logs setter and getter methods to accurately reflect whether logs are being saved to a file, addressing the issue where logs were saved regardless of the save_logs setting.
• Fixes the variable name typo from filaname to filename in both the __init__ method and the save_logs setter, improving code readability and consistency.

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 44.44444% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 78.48%. Comparing base (2502d04) to head (a4f64e7).

Files	Patch %	Lines
pandasai/helpers/logger.py	44.44%	15 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1169 +/- ## ========================================== - Coverage 78.56% 78.48% -0.09% ========================================== Files 117 117 Lines 4624 4630 +6 ========================================== + Hits 3633 3634 +1 - Misses 991 996 +5 ```

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[gventuri]

Refactors logging behavior in Logger class to correctly handle verbose and save_logs settings.

• Fixes a typo from filaname to filename for more accurate file handling.
• Modifies log appending logic to only append logs if verbose is True or the log level is above INFO, addressing the issue where verbose mode did not print anything.
• Adjusts the verbose property setter to clear all handlers before adding a new StreamHandler, ensuring that toggling the verbose flag works as expected.
• Enhances the save_logs property setter and getter to correctly identify and manage FileHandler instances, preventing logs from being added to pandasai.log when save_logs is False.

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For more details, open the Copilot Workspace session.