Not able to set/see breakpoints via the UI

Remark: I'm currently only using "attach" so this may be only related to this.

Expectation:

• have [F9] toggle breakpoint ... toggle the breakpoint
• be able to click on a line to add to the breakpoints
• be able to manually enter a breakpoint in the breakpoint view of vscode and have the extension sending the appropriate breakpoint command to GDB
• ideally do this via th new cbreak implementation, which should also allow conditional breakpoints (at least for the current run)