Added more options to config file (spaces, line length and safety checks)

[geugenm]

This PR adds configuration file support for formatting options that were previously only available via command line.

Added Configuration Options:

• line_length: Controls maximum line length
• use_spaces: Controls indentation type (spaces vs tabs)
• safety_checks: Controls parse tree validation and formatting stability checks

Priority Logic:
Command line arguments still take precedence over config file settings, maintaining backward compatibility while adding configuration flexibility.

Example Configuration:

# Core formatting options
line_length: 100
use_spaces: true
safety_checks: true

# Existing options remain unchanged
excluded_directories: !!set
  .git: null
  addons: null

Changes:

• Updated main function to respect config-based settings with proper fallbacks
• Maintained existing CLI argument priority over config values
• Small reformatting of imports, sorted them alphabetically (used python black formatter)

The changes are minimal and focused solely on moving three existing CLI-only options into the configuration file system.

[geugenm]

Dedicated issue - #345