feat: delete entry from the picker without closing telescope (#828)

This action is not mapped but you can do it yourself in your telescope setup call
Example config:
```lua
require("telescope").setup {
  pickers = {
    buffers = {
      mappings = {
        i = {
          ["<c-d>"] = "delete_buffer",
        }
      }
    }
  }
}
```

lua/telescope/actions/init.lua

@@ -650,6 +650,15 @@ actions.open_loclist = function(_)
   vim.cmd [[lopen]]
 end
 
+--- Delete the selected buffer or all the buffers selected using multi selection.
+---@param prompt_bufnr number: The prompt bufnr
+actions.delete_buffer = function(prompt_bufnr)
+  local current_picker = action_state.get_current_picker(prompt_bufnr)
+  current_picker:delete_selection(function(selection)
+    vim.api.nvim_buf_delete(selection.bufnr, { force = true })
+  end)
+end
+
 -- ==================================================
 -- Transforms modules and sets the corect metatables.
 -- ==================================================