feat: make AST logging extraction opt-in via CLI toggle

[ajithksr]

This PR makes the AST-based logging extraction feature an opt-in CLI toggle, improving the default performance and usability for users who do not need logging analysis.

Changes:

• Refactored GenericLogExtractor to load configuration lazily based on environment variables.
• • Added --enable-logging and --logging-config PATH arguments to graphify extract and graphify update.
• • Updated inline CLI help and README.md to document the new flags.
• • Updated test suite to verify the disabled-by-default behavior and the opt-in extraction.
    All 128 tests pass successfully.

[ajithksr]

Hello @safishamsi just checking in to see if you have bandwidth to review this PR. Let me know if you need any further context or changes to get this merged!" I intend to provide a featire where we can use graphify to extract all comment blocks from with in a function...with a traget to improve logging analysis in linux/android world.