Enhance Java debugger functionality

[tolusha]

To have fully functional java debugger we need to implement the following features:

• show list of threads Show thread dumps when debug is suspended [JDB] #3708
• Watch list via editor Debugger watch list #6022
• Run to Cursor enables you to jump to the cursor position ignoring existing breakpoints on the way. Run to cursor #6547
• Breakpoint with conditions Breakpoint with conditions #6545

To set the break condition, enable condition by selecting the appropriate check box, and enter the desired expression in the Condition field.
If the expression evaluates to true, the user-selected actions are performed. If the evaluation result is false, the breakpoint does not produce any effect.

• Suspend Breakpoints. Suspend breakpoint policy #6846
  Select this check box to enable suspend policy for a breakpoint. This screenshot taken and description taken from Intellij Idea, think we need similar behavior
  

Suspend policy	Description
All	When a breakpoint is hit, all threads are suspended.
Thread	When a breakpoint is hit, the thread where the breakpoint is hit, is suspended.
Make default	Click this button if you want the suspend policy specified for the breakpoint in question to be used as the default one for the subsequently created breakpoints.

• Disabling a breakpoint temporarily Disabling a breakpoint temporarily #6845
• Navigate to breakpoint Navigate to breakpoint #6843
• Java Debugger evaluates only simple expressions (investigation) Java Debugger evaluates only simple expressions #7006