Adds functionality to `modes/javascript-analysis.sh` to scan JavaScript files for custom patterns defined by you.
Key features:
- You can provide a list of regex patterns in `/usr/share/sniper/conf/interesting_js_patterns.txt`.
- The script iterates through downloaded JavaScript files and searches for matches using the provided patterns.
- Findings are saved to `$LOOT_DIR/web/javascript-$TARGET-custom_findings.txt`.
- If the pattern file is not found, the step is skipped with a notification.
- Output file is created only if matches are found, and includes a descriptive header.
This allows you to extend JavaScript analysis with your own specific keywords and regular expressions for finding sensitive information or other items of interest.