Add Basic Event Logging

[jordanpartridge]

Add simple event logging for API interactions:

// In config/github-client.php
'logging' => [
    'enabled' => true,
    'channel' => 'github',
    'level' => 'debug',
],

Events to log:

• API requests and responses
• Rate limit warnings
• Authentication issues
• Cache hits/misses

Implementation:

1. Add logging config
2. Create LoggingMiddleware
3. Define log format
4. Add to pipeline
5. Document logging options

Helps with debugging and monitoring.