Move dependencies to gradle version catalog and clean up buildscripts

native/build.gradle.kts

@@ -3,12 +3,8 @@ plugins {
     `maven-publish`
 }
 
-val guavaVersion: String by project.extra
-val nettyVersion: String by project.extra
-val checkerFrameworkVersion: String by project.extra
-
 dependencies {
-    implementation("com.google.guava:guava:${guavaVersion}")
-    implementation("io.netty:netty-handler:${nettyVersion}")
-    implementation("org.checkerframework:checker-qual:${checkerFrameworkVersion}")
+    implementation(libs.guava)
+    implementation(libs.netty.handler)
+    implementation(libs.checker.qual)
 }