Expose the build command to more places

Below are some feedbacks from user surveys:

• there no build and run feature in a click like netbeans.
• Add a command to rebuild the project the current active file is part of.
• "I really like editing in VS Code but find it not as powerful as tools like Eclipse for build and debug. "
• The burden I got is there was not shortcut for compile java code, it would be awesome if we had it."
• For a maven project I find I have to routinely run "mvn clean compile" after making code changes before it will build.

Actually, we have build action which is called Force Java Compilation, it looks like we need to do some enhancement to expose it to more places. Some ideas:

1. Expose build action to more places (for example, can be invoked in Java Project explorer)
2. Allow to build some of the projects instead of the entire workspace
3. Considering renaming it?? - Because in other IDEs they all call it build, here we call it compilation
4. Ask VS Code to have a dedicate tool bar menu called build or sth...

Start by locating the existing Force Java Compilation action and how commands are exposed in the Java Project explorer and VS Code UI. Define the intended scope with maintainers, then consider the work complete when the build action is available in the agreed locations and can target the agreed project scope.