feat(scout): fix queue configuration options

[faraweilyas]

Fix Scout queue configuration options

Description

This PR fixes Laravel Scout's queue configuration by expanding from a simple boolean flag to a nested array structure, allowing developers to specify custom queue connections and queue names while maintaining full backward compatibility.

Checkout the queue doc section to spot the bug.

Changes Made

• Expand queue configuration structure: Changed from 'queue' => boolean to nested array with enable, connection, and queue options
• Update queue checks in Searchable trait: Modified makeSearchable() and removeFromSearch() methods to use config()->boolean('scout.queue.enable') instead of config('scout.queue')
• Add environment variable support: Introduced SCOUT_QUEUE_CONNECTION and SCOUT_QUEUE_NAME for easier configuration management
• Update configuration comments: Revised inline comments to reflect the new structure and available options
• Maintain backward compatibility: Existing SCOUT_QUEUE=true/false continues to work as expected

Benefits to End Users

• Greater flexibility: Developers can now route Scout operations to specific queue connections (e.g., separate Redis instance for search indexing)
• Better queue organization: Ability to use dedicated queue names for Scout operations, improving monitoring and job separation
• Easier deployment management: Environment-based configuration makes it simple to use different queue setups across environments
• Zero breaking changes: Existing applications continue to work without any code changes
• More explicit configuration: Using config()->boolean() provides clearer intent and better type safety

Code Changes

config file updates:

// Before
'queue' => env('SCOUT_QUEUE', false),

// After
'queue' => [
    'enable' => env('SCOUT_QUEUE', false),
    'connection' => env('SCOUT_QUEUE_CONNECTION'),
    'queue' => env('SCOUT_QUEUE_NAME'),
],

Searchable trait updates:

// Before
if (! config('scout.queue')) {
    return $this->syncMakeSearchable($models);
}

// After  
if (! config()->boolean('scout.queue.enable')) {
    return $this->syncMakeSearchable($models);
}

// Before
if (! config('scout.queue')) {
    return $this->syncRemoveFromSearch($models);
}

// After  
if (! config()->boolean('scout.queue.enable')) {
    return $this->syncRemoveFromSearch($models);
}

[taylorotwell]

Seems like a breaking change with the way this is implemented.