Recommended Gradle for Java in Gradle workspaces

[CsCherrYY]

Currently Gradle for Java (vscjava.vscode-gradle) is not a part of vscode-java-pack, as the first step to extend the visibility of the extension, we can try to recommend it in Gradle workspaces to let more users know it.

Gradle workspace indicator:

• workspace root folder contains settings.gradle(.kts)
• workspace root folder contains build.gradle(.kts)

Gradle distribution installed in local machine:

• command gradle is available in PATH environment