Support and document how to set a function breakpoint.

Environment

• Operating System: macOS 10.13.3 High Sierra
• JDK version: 8
• Visual Studio Code version: 1.21.1
• Java extension version: 0.21.0
• Java Debugger extension version: 0.7.0

Steps To Reproduce

1. Set a function breakpoint in vscode by clicking the + button in the Breakpoints view and entering a method name from a Java class.
2. If not already started, start a Java debug session for that code.
3. Execute code that exercises that function.

Current Result

Execution is not paused in the debugger.

Expected Result

Execution is paused at the point when the function is called and the debugger displays information about the execution context.

Additional Information

It may be that this functionality is supported and I am simply creating the function breakpoint incorrectly. If this is the case then the readme and/or wiki should document how to correctly create a function breakpoint for Java code.