chore: migrate Maven coordinates and packages to easy4j

Update groupId to io.github.easy4j and relocate io/com.github.hiwepy
packages to io.github.easy4j. Class names are unchanged.

Author: loong10k

pom.xml

@@ -2,7 +2,7 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
-	<groupId>io.github.hiwepy</groupId>
+	<groupId>io.github.easy4j</groupId>
 	<artifactId>agora-java-sdk</artifactId>
 	<description>Agora Cloud Recording Java SDK (Spring Boot Independent)</description>
 	<version>1.0.x.20260630-SNAPSHOT</version>