Fix connection init && config publishing (#20)

Author: evgeek

README.md

@@ -16,6 +16,7 @@
 
 ```shell
 composer require umbrellio/php-table-sync
+php artisan vendor:publish --tag=config-table-sync
 ```
 
 ## Usage

src/Integration/Laravel/TableSyncServiceProvider.php

@@ -35,7 +35,7 @@ public function boot(): void
 
         $this->publishes([
             $config => base_path('config/table_sync.php'),
-        ], 'config');
+        ], 'config-table-sync');
     }
 
     public function configureChannel(): void

src/Rabbit/ConnectionContainer.php

@@ -12,7 +12,7 @@ class ConnectionContainer
 {
     private mixed $waitBeforeReconnectMicroseconds = 1000000;
 
-    private ?AbstractConnection $connection;
+    private ?AbstractConnection $connection = null;
 
     public function __construct(
         private readonly string $host,