Allow users to set the language level and preview options in the “Configure Classpath” webview

[testforstephen]

I am using VS Code and I would like to experiment with the new features of Java 21. However, I am not sure how to set the java version to 21 and turn on the compiler preview options in the Java extension. It would be helpful if the language level and preview options were available in the “Configure Classpath” webview.

[cypher256]

For reference:
Enabling Java preview features
https://github.com/redhat-developer/vscode-java/wiki/Enabling-Java-preview-features

[testforstephen]

@cypher256 thanks for the information.

I would like to have a section in the “Configure Classpath” view that allows me to set the language level and preview features for my Java projects. The current setting “java.configuration.runtimes” is not very intuitive or easy to locate.

[cypher256]

@testforstephen It's very user-friendly and very good.