cmake: Add debugger

CMake Debugger

• Depends on !8341 (closed) EDIT: nlohmann-json is no longer needed, see !8338 (comment 1365780).
• Depends on cppdap (!8342 (merged)) and jsoncpp.
• Add --debugger argument to enable the Debugger.
• Add --debugger-pipe argument for DAP traffics over named pipes.
• Support breakpoints by filenames and line numbers.
• Support exception breakpoints.
• Call stack shows filenames and line numbers.
• Show Cache Variables.
• Show the state of currently defined targets, tests and directories with their properties
• Add cmakeVersion to DAP initialize response.
• Include unit tests.
• Some screenshots

Screenshots (click to expand)

Topic-rename: cmake-debugger