feat: make psutil, rapidfuzz, and google-cloud-secret-manager optional for WASM compatibility

- Remove psutil and rapidfuzz from main dependencies (marked as unused)
- Move google-cloud-secret-manager to dev extras group
- Add new 'system' extras group for psutil and rapidfuzz
- Update deptry configuration comments to reflect optional status

This enables airbyte-cdk to be installed in WASM environments like Pyodide
by making problematic binary dependencies optional.

Co-Authored-By: AJ Steers <[email protected]>

Author: devin-ai-integration[bot]