Add Broma formatter tool

[LPuehringerStudent]

Fixes #20

This PR adds a Python-based code formatter for .bro binding files.

Features

• Preserves comments
• Consistent tab indentation
• Normalizes spacing around operators
• Adds blank lines between classes
• Handles platform-specific addresses (win, imac, m1, ios, android)

Usage

python tools/broma_formatter.py file.bro              # Print to stdout
python tools/broma_formatter.py --inplace file.bro    # Format in place
python tools/broma_formatter.py --inplace --recursive .  # Format all files
python tools/broma_formatter.py --check file.bro      # CI check mode

The formatter is intentionally conservative - it only changes whitespace and formatting, not the actual structure of the bindings.