Feature: "Top Largest" Mode (Disk Space Priority)

[tejaswankalluri]

Problem:
Users often need to free up a specific amount of disk space immediately (e.g., 5GB) without worrying about the age of the resources. The current tool doesn't support prioritizing cleanup based on size.

Proposed Solution:
Add a "Top Largest" mode to prioritize cleaning the largest resources first.

Requirements:

1. New Flags:

   • --limit-space <size>: Clean resources until the specified amount of space is reclaimed (e.g., 5GB, 500MB).
   • --top <number>: Select the top N largest resources to clean.

2. Logic:

   • Sort scan results by size in descending order.
   • Select items starting from the largest until the criteria (space limit or count limit) is met.

3. Implementation Details:

   • Reuse existing size string parsing logic in src/docker.ts.
   • Implement sorting and selection logic in src/scan.ts.
   • Ensure the summary and confirmation prompts reflect the selected subset of resources.