Add lldb version into initialize response lldb-dap (#98703)
Frequently, while troubleshooting user's debugging issues in VScode, we
would like to know lldb version so that we can confirm if certain
patch/feature is in or not.
This PR adds version string into `initialize` response so that telemetry
can track it.
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Co-authored-by: jeffreytan81 <jeffreytan@fb.com>