Replace 'if (false)' with interface_exists checks

Updated several interface files to use 'if (! interface_exists(...))' instead of 'if (false)' for conditional interface declarations. This improves clarity and ensures interfaces are only declared when not already present.

Co-Authored-By: Deeka Wong <8337659+huangdijia@users.noreply.github.com>

Author: huangdijia

src/Contract/LoggerInterface.php

@@ -13,7 +13,7 @@
 
 class_alias(\Psr\Log\LoggerInterface::class, LoggerInterface::class);
 
-if (false) { // @phpstan-ignore if.alwaysFalse
+if (! interface_exists(LoggerInterface::class)) {
     interface LoggerInterface extends \Psr\Log\LoggerInterface
     {
     }