FEAT: Adding cursor.skip(n)

[jahnvi480]

Work Item / Issue Reference

AB#34924

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Summary

This pull request introduces a new convenience method, skip, to the Cursor class in mssql_python/cursor.py, which allows users to advance the cursor position by a specified number of rows without fetching them. Comprehensive tests have been added to validate the method's behavior, including edge cases and integration with existing fetch methods.

New feature: Cursor skipping

• Added skip(count: int) method to the Cursor class, enabling users to efficiently advance the cursor by a given number of rows without returning those rows. The method checks for closed cursors, validates arguments, supports no-op for zero, and raises appropriate errors for invalid usage.

Testing and validation

• Added test_cursor_skip_basic_functionality to verify that skip advances the cursor as expected and integrates correctly with fetchone.
• Added tests for edge cases: skipping zero rows (test_cursor_skip_zero_is_noop), empty result sets (test_cursor_skip_empty_result_set), skipping past the end (test_cursor_skip_past_end), invalid arguments (test_cursor_skip_invalid_arguments), and closed cursors (test_cursor_skip_closed_cursor).
• Added integration tests to ensure skip works correctly with fetchone, fetchmany, and fetchall methods (test_cursor_skip_integration_with_fetch_methods).

[gargsaumya]

Since skip() is just an alias for scroll(count, 'relative'), it carries the same inefficiency concerns for large skips. Approving for now.

[sumitmsft]

Please make the changes to the logic of PR# 180 as this PR depends on it. Let's hold on to it for now.

[jahnvi480]

@sumitmsft @gargsaumya Resolved comments in #180 Please have a look at it and let me know if there are any other changes required.