[lldb] [llvm] [lldb-dap] Add multi-session support with shared debugger instances (PR #163653)

[John Harrison via llvm-commits]

https://github.com/ashgti commented:

Can we also add a test in test/API/tools/lldb-dap for this? Maybe in the test/API/tools/lldb-dap/startDebugging folder?

https://github.com/llvm/llvm-project/pull/163653