Proposal to add a couple exampels to native gdb adapter wiki

[shmerl]

A couple of examples for native gdb adapter wiki that might be generally useful for those who want to start using it:

dap.configurations.c = {
...
   
   {  -- needs privileges to be able to attach, see for example https://www.kernel.org/doc/html/latest/admin-guide/LSM/Yama.html
      name = "Select and attach to process",
      type = "gdb",
      request = "attach",
      program = function()
         return vim.fn.input('Path to executable: ', vim.fn.getcwd() .. '/', 'file')
      end,
      pid = function()
         local name = vim.fn.input('Executable name (filter): ')
         return require("dap.utils").pick_process({ filter = name })
      end,
      cwd = '${workspaceFolder}'
   },
   {
      name = 'Attach to gdbserver :1234',
      type = 'gdb',
      request = 'attach',
      target = 'localhost:1234',
      program = function()
         return vim.fn.input('Path to executable: ', vim.fn.getcwd() .. '/', 'file')
      end,
      cwd = '${workspaceFolder}'
   },
...
}