Add local launch support to GDB MI adapter

[xusheng6]

Summary

• Add Execute/ExecuteWithArgs implementation to the GDB MI adapter for local debugging
• Extract common GDB startup logic into StartGdbAndDetectArch helper
• Add CanExecute to GdbMiAdapterType for Linux/macOS ELF and Mach-O binaries
• Register launch-related settings (executable path, working directory, command line args)
• Track local vs remote sessions with m_isLocalSession flag

Test plan

• Launch a local ELF binary using the GDB MI adapter on Linux
• Verify breakpoints, stepping, and stop/resume work in local mode
• Verify remote connect still works as before
• Verify restart works for both local and remote sessions

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