Refactor requirements and clarify benchmark harness instructions

[bscriver123]

Pull Request Description

Issue Addressed

Fixes several issues encountered while rerunning swe-bench-lite with aider.

Changes Made

1. Updated installation instructions in README.md to include creating a virtual environment before running pip install -r requirements.txt.
2. Clarified the suggestion to read SWE-Bench docker docs for image building/pulling procedures.
3. Modified harness.py:
   • Uncommented the import of get_lite_dataset.
   • Imported all necessary functions and added a # noqa comment.
   • Addressed the use of just_devin_570, ensuring it is appropriately disabled for lite datasets.
   • Resolved the NotImplementedError related to loading cached datasets in a LocalFileSystem.

Additional Improvements

1. Included a frozen requirements file to prevent future issues with external dependencies.
2. Enhanced clarity and consistency throughout the codebase for a more streamlined experience.

Resolves

• Issue Title: A few issues while trying to rerun swe-bench-lite with aider

Suggestions for Reviewers

• Please review the modifications in the installation instructions, harness.py script, and the inclusion of a frozen requirements file.
• Feedback on the clarity and effectiveness of the code improvements is appreciated.

Related Links

• Documentation for SWE-Bench
• Related Issue #X
• Related PR #X