Improve error handling and logging in MalwareDomainCheck

[kokatesaurabh]

Description

This PR enhances error handling and logging in MalwareDomainCheck.py to improve reliability and debugging:

• Added specific exception handling for FileNotFoundError, PermissionError, and IOError.
• Implemented pre-flight checks for database file existence and permissions.
• Added input validation for URLs and domains.
• Improved logging with detailed messages and progress tracking.
• Ensured graceful degradation on errors.

Changes

• Updated malware_check, maltrail_check, scan, verify_domain, get_netloc, and get_domains.
• Added file existence and permission checks.
• Enhanced logging for better traceability.

Testing

• Tested normal operation with valid domains and database files.
• Tested edge cases: missing database files, permission errors, empty databases, invalid URLs.
• Verified log output in mobsf.log for all scenarios.
• Confirmed no regressions in existing functionality.

Impact

• Prevents crashes due to missing or inaccessible database files.
• Improves debugging with clear, specific error messages.
• Maintains backward compatibility.

Related Issues

• Addresses common issues with missing or inaccessible database files.

Checklist

• Code follows MobSF coding standards.
• Tested locally with multiple scenarios.
• No breaking changes introduced.