Enhance CLI argument parsing and add max file lines option for context splitting

[mathiasesn]

This pull request introduces several changes to the repo_context module, primarily focusing on adding functionality to split context files based on a maximum number of lines and updating related tests. The most important changes include modifying the convert method to support splitting context files, updating the CLI to accept a new argument for the maximum number of lines, and adding comprehensive tests for the new functionality.

Changes to repo_context/cli.py:

• Modified the --output argument to specify an output directory instead of a file path.
• Added a new argument --max-file-lines to specify the maximum number of lines in context files.
• Updated the main function to handle multiple context files and write each to a separate file.

Changes to repo_context/repo_converter.py:

• Updated the convert method to support splitting context files based on the maximum number of lines. [1] [2]
• Added a new method _split_context to handle the logic for splitting context files.

Changes to tests/test_repo_converter.py:

• Updated existing tests to accommodate the changes in the convert method.
• Added new tests to verify the functionality of the _split_context method, including edge cases and error handling.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
repo_context
cli.py	37	37	0%	1–82
repo_converter.py	142	27	81%	57–59, 64–66, 98, 132–133, 175, 255–256, 259–260, 263–269, 287–288, 299, 306, 311, 316
TOTAL	191	64	67%

Tests	Skipped	Failures	Errors	Time
19	0 💤	0 ❌	0 🔥	0.625s ⏱️