Fix Java examples using Kotlin-specific syntax

Java examples were incorrectly using Kotlin-specific syntax like listOf() and mapOf(). This commit fixes the issue by:

- Added language-specific parameter support to getParamExample() method in Kotlin.php
- Created getKotlinMapExample() and getJavaMapExample() helper methods for proper syntax generation
- Updated getPermissionExample() to support both Java (Arrays.asList) and Kotlin (listOf) syntax
- Added new javaParamExample Twig filter that generates Java-compatible syntax
- Updated Java example templates to use javaParamExample filter
- Fixed import ordering in Java templates to follow Java conventions (java.* imports first, then project imports)

Now Java examples correctly use:
- Arrays.asList() instead of listOf()
- new HashMap<String, Object>() {{ put() }} instead of mapOf()
- Collections.emptyList() instead of listOf()

Author: ChiragAgg5k