feature request: select java runtime in vs code settings

The current state of Java runtime support seems to be:

• this extension needs Java 11
• you can specify available runtimes in java.configuration.runtimes
• however you can't specify/force which of these versions to use in a project; instead there's some auto detection that looks into eclipse/maven/gradle config

As we see in #1543 a lot of people are not happy with this situation. Me neither. Please add runtime selection in VS Code settings, so that one can force the usage of e.g. JavaSE-1.8 per workspace or even per directory.

Environment

• Operating System: Windows 10
• JDK version: OpenJDK 11 and Corretto JDK 8
• Visual Studio Code version: 1.50.1
• Java extension version: redhat.java v0.69.0, vscjava.vscode-java-pack v0.10.0

Steps To Reproduce

1. install JDK 8
2. install JDK 11 (-> system default)
3. open vs code
4. open a Java project and try to build it with JDK 8 (without changing java.home, because VS Code Java extension requires JDK 11)

Current Result

autodetection might work if eclipse/mvn/gradle settings are found that specify Java 8, otherwise JDK 11 is being used

Expected Result

usage of JDK 8 can be forced by VS Code settings per workspace or per directory

Additional Informations