Move `serial` Library to Gradle

[Stefterv]

Most relevant area for this enhancement?

Build process

Feature to enhance

Build system

Desired enhancement

In PR #888 I took a little shortcut with the existing Java based libraries and made them still reliant on the old Ant build system.

We would need the ant based build.xml to be replaced by a proper build.gradle.kts version to further remove our reliance on Ant

Would you like to work on the issue?

This is a great place to start contributing for someone else

https://github.com/processing/processing4/tree/main/java/libraries/serial

[madhav2348]

Hey @Stefterv, can I work on this issue? As a Beginner, this is a good starting point for me