Migrated the svg library from Ant-based build.xml to Gradle build.gradle.kts

[jishnunambiarr]

Resolves

#1098

Changes

• Added Gradle Build logic using Kotlin DSL
• Preserved original Ant functionality with custom task for managing Batik
• Removed the old Ant Based build.xml

Tests

• Clean build from scratch downloads Batik successfully.
• Compilation works with both core.jar and batik.jar dependencies
• Output JAR library/svg.jar generated correctly
• Verified that example code from processing.org/reference/libraries/svg runs as expected

Caveats

The backupUrl from the build.xml seems to be broken: https://download.processing.org/batik/batik-bin-1.19.zip
Please let me know if there is an alternative or if I have missed something here.

Let me know if I need to make further adjustments!